Today on Informatics class Nastya learned about GCD and LCM (see links below). Nastya is very intelligent, so she solved all the tasks momentarily and now suggests you to solve one of them as well.

We define a pair of integers (a, b) good, if GCD(a, b) = x and LCM(a, b) = y, where GCD(a, b) denotes the greatest common divisor of a and b, and LCM(a, b) denotes the least common multiple of a and b.

You are given two integers x and y. You are to find the number of good pairs of integers (a, b) such that l ≤ a, b ≤ r. Note that pairs (a, b) and (b, a) are considered different if a ≠ b.


-----Input-----

The only line contains four integers l, r, x, y (1 ≤ l ≤ r ≤ 10^9, 1 ≤ x ≤ y ≤ 10^9).


-----Output-----

In the only line print the only integer — the answer for the problem.


-----Examples-----
Input
1 2 1 2

Output
2

Input
1 12 1 12

Output
4

Input
50 100 3 30

Output
0



-----Note-----

In the first example there are two suitable good pairs of integers (a, b): (1, 2) and (2, 1).

In the second example there are four suitable good pairs of integers (a, b): (1, 12), (12, 1), (3, 4) and (4, 3).

In the third example there are good pairs of integers, for example, (3, 30), but none of them fits the condition l ≤ a, b ≤ r.

Difficulty: interview

Starter code:

Solutions:
from math import sqrt
from fractions import gcd
l, r, x, y = list(map(int, input().split()))
if y % x != 0:
    print(0)
    return
lo = (l + x - 1) // x
hi = r // x
p = y // x
s = 0

k1 = 1
while k1 * k1 <= p:
    k2 = p // k1
    if lo <= k1 <= hi and lo <= k2 <= hi and gcd(k1, k2) == 1 and k1 * k2 == p:
        s += 1 + (k1 != k2)
    k1 += 1
print(s)


#     Codeforces Round #489 (Div. 2)
import collections
from functools import cmp_to_key
#key=cmp_to_key(lambda x,y: 1 if x not in y else -1 )

import sys
def getIntList():
    return list(map(int, input().split()))    
import bisect
 
            
def getfactor(t):
    r = {}
    for x in range(2,100000):
        while t%x ==0:
            t = t//x
            if x not in r: r[x] = 1
            else:
                r[x] +=1
    if t> 1:
        r[t] = 1
    return r

L,R,X,Y = getIntList()

af = getfactor(X)
bf = getfactor(Y)
#print(af,bf)

base = X
res = set()
if X==Y :
    res.add( (X,Y))
for x in af:
    if x not in bf or af[x] > bf[x]:
        print(0)
        return
    bf[x] -= af[x]
    
z = [x for x in bf if bf[x] >0 ]
n = len(z)

def search(a,b, d):
    if d == n:
        res.add((a,b))
        return
    nt = z[d] ** bf[z[d]]
    search ( a * nt, b, d+1)
    search ( a , b* nt, d+1)
search(base,base,0)

r = 0
for x in res:
    if x[0] >=L and x[0] <=R and x[1] >=L and x[1] <=R: r+=1
print(r)


import math
def gcd(x,y):
    while x and y:
        x%=y
        if x: y%=x
    return x+y
def lcm(x,y):
    return x*y//gcd(x,y)
tl,tr,tx,ty=input().split()
l=int(tl)
r=int(tr)
x=int(tx)
y=int(ty)
t=[]
cnt=0
for i in range(1,int(math.sqrt(y))+1):
    if  y%i==0 and i>=l and i<=r:
        t.append(i)
        cnt+=1
    if y%i==0 and i*i!=y and y//i>=l and y//i<=r:
         t.append(y//i)
         cnt+=1
#for i in t:print(i)
ans=0
for i in range(cnt):
    for j in range(cnt):
        if gcd(t[i],t[j])==x and t[i]*t[j]==x*y:
            ans+=1
print(ans)


from math import sqrt 

def p_divs(n):
  _a = []
  for _i in range(2,int(sqrt(n)) + 10):
    while n % _i == 0:
      _a.append(_i)
      n //= _i
  if n > 1:
    _a.append(n)
  return _a
  
l, r, x, y = list(map(int, input().split()))

if y % x != 0:
  print(0)
else:
  m = y // x
  divs = p_divs(m)

  d = dict()
  for p in divs:
    if p in d:
      d[p] += 1
    else:
      d[p] = 1
  p = []
  for k in d:
    p.append((k, d[k]))
  
  ans = 0
  for i in range(2**len(p)):
    a,b = x,x
    for k in range(len(p)):
      if (i // (2**k)) % 2 == 1:
        a *= p[k][0]**p[k][1]
      else:
        b *= p[k][0]**p[k][1]
    if a >= l and a <= r and b >= l and b <= r:
      ans += 1
  print(ans)


import sys
from math import sqrt,ceil,gcd

def sieve(N):
    b = [True]*(N+1)
    b[0] = False
    b[1] = False

    lim = ceil(sqrt(N))
    i = 2
    while i <= lim:
        if b[i]:
            for n in range(i**2,N+1,i):
                b[n] = False
        i+=1
    
    return [i for i,b in enumerate(b) if b]

P = sieve(10**5)

def factor(n,P):
    """Given prime list, factorize n"""
    if n in P: return [n]
    f = []
    for p in P:
        while n%p == 0:
            n//=p
            f.append(p)
        if n in P:
            f.append(n)
            return f
    if n != 1:
        f.append(n)
    return f

def divisors(n):
    F = factor(n,P)
    D = {1}
    for f in F:
        D |= {f*d for d in D}
    return D

l,r,x,y = list(map(int,input().split()))

a = x
if y%a != 0:
    print(0)
    return

x//=a
y//=a

cnt = 0
for d in divisors(y):
    n = d*a
    m = y//d*a
    if l<=n<=r and l<=m<=r and gcd(d,y//d) == 1:
        cnt += 1
print(cnt)


l, r, x, y = map(int, input().split())
f = lambda ka, kb: int(gcd(ka*x,kb*x)==x and l <= ka * x <= r and l <= kb * x <= r)
gcd = lambda a, b: a if b == 0 else gcd(b, a % b)
cnt = 0
k = y // x
d = 1
while d * d <= k:
    if k % d == 0:
        cnt += f(d, k // d)
        if d * d != k: cnt += f(k // d, d)
    d += 1
if y % x: cnt = 0
print(cnt)

from math import gcd,sqrt
l,r,x,y=list(map(int,input().split()))
product=x*y
div=int(sqrt(product))
div=((div//x)*x)
ans=0
while(div>=1):
    if(product%div==0):
        div2=product//div
        hcf=gcd(div,div2)
        lcm=(div*div2)//hcf
        if(hcf==x and lcm==y):
            if(div>=l and div<=r and div2>=l and div2<=r):
                ans+=2
                if(div2==div):
                    ans-=1
            else:
                break
    div-=x
print(ans)

from math import gcd
l, r, x, y = map(int, input().split())
a = []
if (y % x != 0):
    print(0)
else:
    y = y // x
    for i in range(1, int(y ** 0.5) + 1):
        if (y % i == 0 and i != y // i):
            a.append([i, y // i])
            a.append([y // i, i])
        elif (y % i == 0):
            a.append([i, i])
    ans = 0
    for i in range(len(a)):
        if (gcd(a[i][0], a[i][1]) == 1 and l <= x * a[i][0] <= r and l <= x * a[i][1] <= r):
            ans += 1
    print(ans)

l, r, x, y = list(map(int, input().split()))
def gcd(a, b):
	while b != 0:
		a, b = b, a % b
	return a
divisor = [1, y]
i = 2
count = 0
while i * i <= y:
	if y % i == 0:
		divisor.append(i)
		if i * i != y:
			divisor.append(y // i)
	i += 1		
for j in divisor:
	if j >= l and j <= r and j % x == 0:
		a = (x * y) // j
		if a >= l and a <= r and gcd(a, j) == x:
			count += 1
print(count)		


			




import math

def get_div(n):
    a = []
    for i in range(1,int(n**.5)+1):
        if n % i == 0:
            a.append([i,n//i])
    return a

tmp = [int(i) for i in input().split()]
l,r,x,y = tmp[0],tmp[1],tmp[2],tmp[3]
if y % x != 0:
    print(0)
else:
    c = 0
    a = get_div(y//x)
    for p in a:
        pl = min(p)
        pr = max(p)
        if math.gcd(pl,pr) == 1:#(1 in p) or (pr % pl != 0):
            if l <= x * pl and x * pr <= r:
                c += 1
                if p[0] != p[1]:
                    c += 1
    print(c)


def gcd(a,b):
    return a if b == 0 else gcd(b, a % b)

l,r,x,y = list(map(int,input().split()))
from math import sqrt
if y % x !=0 :
    print(0)
    return

y = y //x
if l % x != 0 :
    l = l // x + 1
else:
    l  //= x


if r % x != 0 :
    r = r // x
else:
    r  //= x


ans = 0

bound = int(sqrt(y)) + 1
    

for i in range(1, bound + 1):
    if i > y//i:
        break
    if (gcd (i, y//i)) != 1:
        continue
    if y % i == 0:
        if (l <= i <= r) and(l <= y//i <= r):
            if i == y//i:
                ans+=1
            else:
                ans+=2

print(ans)


#!/usr/bin/env python3

from math import sqrt

[l, r, x, y] = list(map(int, input().strip().split()))

if y % x != 0:
	print(0)
	return

y = y // x
l = -((-l) // x)  # ceil
r = r // x

pr = []
i = 2
yx = y
mx = sqrt(yx)
while i <= mx:
	d = 1
	while yx % i == 0:
		d *= i
		yx //= i
	if d > 1:
		pr.append(d)
		mx = sqrt(yx)
	i += 1

if yx > 1:
	pr.append(yx)


def count(a, ar):
	if len(ar) == 0:
		if l <= a <= r and l <= y // a <= r:
			return 1
		else:
			return 0
	res = 0
	res += count(a, ar[1:])
	aa = a * ar[0]
	if aa <= r and y // aa >= l:
		res += count(aa, ar[1:])
	return res

res = count(1, pr)
print (res)


import sys

def gcd (a, b):
  if b == 0:
    return a
  return gcd (b, a % b) 

l, r, x, y = map (int, input().split())
if y % x != 0:
  print (0)
else:
  res = 0
  p = y // x
  t = 1
  while t * t <= p:
    if p % t == 0:
      a = x * t
      b = x * y / a
      if l <= a <= r and l <= b <= r and gcd (a, b) == x:
        if b != a:
          res += 2
        else:
          res += 1

    t += 1
  print (res)

from itertools import product

def factorize(n):
    res = []
    if n % 2 == 0:
        power = 0
        while n % 2 == 0:
            power += 1
            n //= 2
        res.append((2, power))
    i = 3
    while i * i <= n:
        if n % i == 0:
            power = 0
            while n % i == 0:
                power += 1
                n //= i
            res.append((i, power))
        i += 2
    if n > 1:
        res.append((n, 1))
    return res

l, r, x, y = [int(x) for x in input().split()]

if y % x:
    print(0)
    return

diff = y // x

facs = [p ** power for p, power in factorize(diff)]

res = 0
for i in range(2 ** len(facs)):
    fac1 = x
    for j in range(len(facs)):
        if (1 << j) & i: fac1 *= facs[j]
    fac2 = x * y // fac1
    if l <= fac1 <= r and l <= fac2 <= r:
        res += 1
print(res)

from collections import defaultdict

l, r, x, y = list(map(int, input().split()))

if x == y == 1:
    if l == 1:
        print(1)
        return

    print(0)
    return

if y % x != 0:
    print(0)
    return

c = x * y

c_ = y // x
i = 2
del_ = defaultdict(int)
while c_ > 1:
    while c_ % i == 0:
        c_ //= i
        del_[i] += 1

    i += 1

mas = tuple(k ** v for k, v in list(del_.items()))
ln = len(mas)

ans = 0
for i in range(2 ** ln):
    b = bin(i)[2:].zfill(ln)

    a = x
    for j in range(ln):
        if b[j] == '1':
            a *= mas[j]

    b = c // a

    if l <= a <= r and l <= b <= r:
        ans += 1

print(ans)


def f(k):
    res = []
    d = 2
    while d * d <= k:
        if k % d == 0:
            res.append(d)
            k //= d
        else:
            d += 1
    if k != 1:
        res.append(k)
    return res


def main():
    l, r, x, y = list(map(int, input().split()))
    if y % x != 0:
        return 0
    if y == x:
        if l <= x <= r:
            return 1
        else:
            return 0
    a = f(x)
    b = f(y)
    for i in range(len(a)):
       b = b[:b.index(a[i])] + b[b.index(a[i]) + 1:]
    ans = 0
    a = [b[0]]
    for i in range(1, len(b)):
        if b[i] == b[i - 1]:
            a[-1] *= b[i]
        else:
            a.append(b[i])
    for i in range(2 ** len(a)):
        c1 = 1
        c2 = 1
        for j in range(len(a)):
            if (2 ** j) & i:
                c1 *= a[j]
            else:
                c2 *= a[j]
        if l <= x * c1 <= r and l <= x * c2 <= r:
            ans += 1
    return ans
    
print(main())


import math
from fractions import gcd
l,r,x,y=list(map(int,input().strip().split()))
b=math.ceil(l/x)
e=r//x
if (y%x!=0):
	print(0)
	return
y=y/x
if (y==1 and b==1 and e>=1):
	print(1)
	return
ans=0
for i in range(1,math.ceil(math.sqrt(y))):
	if (y%i)==0:
		d=y//i
		if (gcd(i,d)==1 and i>=b and i<=e and d>=b and d<=e):
			if (i==d):
				ans=ans+1
			else:
				ans=ans+2
print (ans)




import math



def gcd(a, b):
    if b == 0:
        return a
    else:
        return gcd(b, a % b)


l, r, x, y = map(int, input().split())
lwall = math.ceil(l / x)
rwall = math.floor(r / x)
n = y // x
ans = 0
if(y % x != 0):
    print(0)
else:
    for i in range(1, int(math.sqrt(n)) + 1):
        if(n % i == 0 and lwall <= i and i <= rwall and gcd(i, n / i) == 1 and (n / i) <= rwall):
            ans += 2
            if(i == math.sqrt(n)):
                ans -= 1
    print(ans)

l,r,x,y=list(map(int,input().split()))
h=[]
a=0
if y%x<1:
 y//=x;s=y;l=(l-1)//x+1;r//=x;i=2
 while i*i<=y:
  j=1
  while y%i<1:
   j*=i;y//=i
  if j>1:h.append(j)
  i+=1
 if y>1:h.append(y)
 m=len(h)
 for i in range(1<<m):
  p=1
  for j, u in enumerate(h):
   if(i>>j)&1:p*=u
  a+=l<=p<=r and l<=s//p<=r
print(a)


l,r,x,y=list(map(int,input().split()))
h=[]
a=0
if y%x<1:
 y//=x;s=y;l=(l-1)//x+1;r//=x;i=2
 while i*i<=y:
  j=1
  while y%i<1:
   j*=i;y//=i
  if j>1:h.append(j)
  i+=1
 if y>1:h.append(y)
 for i in range(1<<len(h)):
  p=1
  for j, u in enumerate(h):
   if(i>>j)&1:p*=u
  a+=l<=p<=r and l<=s//p<=r
print(a)


l,r,x,y=list(map(int,input().split()))
h=()
a=0
if y%x<1:
 y//=x;s=y;l=(l-1)//x+1;r//=x;i=2
 while i*i<=y:
  j=1
  while y%i<1:
   j*=i;y//=i
  if j>1:h+=j,
  i+=1
 if y>1:h+=y,
 for i in range(1<<len(h)):
  p=1
  for j, u in enumerate(h):
   if(i>>j)&1:p*=u
  a+=l<=p<=r and l<=s//p<=r
print(a)


from math import *

def log_finder(x, base):
	for i in range(int(log(x,base)), -1, -1):
		if x % (base ** i) == 0:
			return i

def function():	
	l, r, x, y = [int(x) for x in input().split()]
	s = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1009,1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,3083,3089,3109,3119,3121,3137,3163,3167,3169,3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,3301,3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,3593,3607,3613,3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,3851,3853,3863,3877,3881,3889,3907,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,4211,4217,4219,4229,4231,4241,4243,4253,4259,4261,4271,4273,4283,4289,4297,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,4421,4423,4441,4447,4451,4457,4463,4481,4483,4493,4507,4513,4517,4519,4523,4547,4549,4561,4567,4583,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,4663,4673,4679,4691,4703,4721,4723,4729,4733,4751,4759,4783,4787,4789,4793,4799,4801,4813,4817,4831,4861,4871,4877,4889,4903,4909,4919,4931,4933,4937,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,5009,5011,5021,5023,5039,5051,5059,5077,5081,5087,5099,5101,5107,5113,5119,5147,5153,5167,5171,5179,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,5281,5297,5303,5309,5323,5333,5347,5351,5381,5387,5393,5399,5407,5413,5417,5419,5431,5437,5441,5443,5449,5471,5477,5479,5483,5501,5503,5507,5519,5521,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,5641,5647,5651,5653,5657,5659,5669,5683,5689,5693,5701,5711,5717,5737,5741,5743,5749,5779,5783,5791,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,5861,5867,5869,5879,5881,5897,5903,5923,5927,5939,5953,5981,5987,6007,6011,6029,6037,6043,6047,6053,6067,6073,6079,6089,6091,6101,6113,6121,6131,6133,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,6229,6247,6257,6263,6269,6271,6277,6287,6299,6301,6311,6317,6323,6329,6337,6343,6353,6359,6361,6367,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,6481,6491,6521,6529,6547,6551,6553,6563,6569,6571,6577,6581,6599,6607,6619,6637,6653,6659,6661,6673,6679,6689,6691,6701,6703,6709,6719,6733,6737,6761,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,6841,6857,6863,6869,6871,6883,6899,6907,6911,6917,6947,6949,6959,6961,6967,6971,6977,6983,6991,6997,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,7109,7121,7127,7129,7151,7159,7177,7187,7193,7207,7211,7213,7219,7229,7237,7243,7247,7253,7283,7297,7307,7309,7321,7331,7333,7349,7351,7369,7393,7411,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,7507,7517,7523,7529,7537,7541,7547,7549,7559,7561,7573,7577,7583,7589,7591,7603,7607,7621,7639,7643,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,7727,7741,7753,7757,7759,7789,7793,7817,7823,7829,7841,7853,7867,7873,7877,7879,7883,7901,7907,7919,7927,7933,7937,7949,7951,7963,7993,8009,8011,8017,8039,8053,8059,8069,8081,8087,8089,8093,8101,8111,8117,8123,8147,8161,8167,8171,8179,8191,8209,8219,8221,8231,8233,8237,8243,8263,8269,8273,8287,8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6433,16447,16451,16453,16477,16481,16487,16493,16519,16529,16547,16553,16561,16567,16573,16603,16607,16619,16631,16633,16649,16651,16657,16661,16673,16691,16693,16699,16703,16729,16741,16747,16759,16763,16787,16811,16823,16829,16831,16843,16871,16879,16883,16889,16901,16903,16921,16927,16931,16937,16943,16963,16979,16981,16987,16993,17011,17021,17027,17029,17033,17041,17047,17053,17077,17093,17099,17107,17117,17123,17137,17159,17167,17183,17189,17191,17203,17207,17209,17231,17239,17257,17291,17293,17299,17317,17321,17327,17333,17341,17351,17359,17377,17383,17387,17389,17393,17401,17417,17419,17431,17443,17449,17467,17471,17477,17483,17489,17491,17497,17509,17519,17539,17551,17569,17573,17579,17581,17597,17599,17609,17623,17627,17657,17659,17669,17681,17683,17707,17713,17729,17737,17747,17749,17761,17783,17789,17791,17807,17827,17837,17839,17851,17863,17881,17891,17903,17909,17911,17921,17923,17929,17939,17957,17959,17971,17977,17981,17987,17989,18013,18041,18043,18047,18049,18059,18061,18077,18089,18097,18119,18121,18127,18131,18133,18143,18149,18169,18181,18191,18199,18211,18217,18223,18229,18233,18251,18253,18257,18269,18287,18289,18301,18307,18311,18313,18329,18341,18353,18367,18371,18379,18397,18401,18413,18427,18433,18439,18443,18451,18457,18461,18481,18493,18503,18517,18521,18523,18539,18541,18553,18583,18587,18593,18617,18637,18661,18671,18679,18691,18701,18713,18719,18731,18743,18749,18757,18773,18787,18793,18797,18803,18839,18859,18869,18899,18911,18913,18917,18919,18947,18959,18973,18979,19001,19009,19013,19031,19037,19051,19069,19073,19079,19081,19087,19121,19139,19141,19157,19163,19181,19183,19207,19211,19213,19219,19231,19237,19249,19259,19267,19273,19289,19301,19309,19319,19333,19373,19379,19381,19387,19391,19403,19417,19421,19423,19427,19429,19433,19441,19447,19457,19463,19469,19471,19477,19483,19489,19501,19507,19531,19541,19543,19553,19559,19571,19577,19583,19597,19603,19609,19661,19681,19687,19697,19699,19709,19717,19727,19739,19751,19753,19759,19763,19777,19793,19801,19813,19819,19841,19843,19853,19861,19867,19889,19891,19913,19919,19927,19937,19949,19961,19963,19973,19979,19991,19993,19997,20011,20021,20023,20029,20047,20051,20063,20071,20089,20101,20107,20113,20117,20123,20129,20143,20147,20149,20161,20173,20177,20183,20201,20219,20231,20233,20249,20261,20269,20287,20297,20323,20327,20333,20341,20347,20353,20357,20359,20369,20389,20393,20399,20407,20411,20431,20441,20443,20477,20479,20483,20507,20509,20521,20533,20543,20549,20551,20563,20593,20599,20611,20627,20639,20641,20663,20681,20693,20707,20717,20719,20731,20743,20747,20749,20753,20759,20771,20773,20789,20807,20809,20849,20857,20873,20879,20887,20897,20899,20903,20921,20929,20939,20947,20959,20963,20981,20983,21001,21011,21013,21017,21019,21023,21031,21059,21061,21067,21089,21101,21107,21121,21139,21143,21149,21157,21163,21169,21179,21187,21191,21193,21211,21221,21227,21247,21269,21277,21283,21313,21317,21319,21323,21341,21347,21377,21379,21383,21391,21397,21401,21407,21419,21433,21467,21481,21487,21491,21493,21499,21503,21517,21521,21523,21529,21557,21559,21563,21569,21577,21587,21589,21599,21601,21611,21613,21617,21647,21649,21661,21673,21683,21701,21713,21727,21737,21739,21751,21757,21767,21773,21787,21799,21803,21817,21821,21839,21841,21851,21859,21863,21871,21881,21893,21911,21929,21937,21943,21961,21977,21991,21997,22003,22013,22027,22031,22037,22039,22051,22063,22067,22073,22079,22091,22093,22109,22111,22123,22129,22133,22147,22153,22157,22159,22171,22189,22193,22229,22247,22259,22271,22273,22277,22279,22283,22291,22303,22307,22343,22349,22367,22369,22381,22391,22397,22409,22433,22441,22447,22453,22469,22481,22483,22501,22511,22531,22541,22543,22549,22567,22571,22573,22613,22619,22621,22637,22639,22643,22651,22669,22679,22691,22697,22699,22709,22717,22721,22727,22739,22741,22751,22769,22777,22783,22787,22807,22811,22817,22853,22859,22861,22871,22877,22901,22907,22921,22937,22943,22961,22963,22973,22993,23003,23011,23017,23021,23027,23029,23039,23041,23053,23057,23059,23063,23071,23081,23087,23099,23117,23131,23143,23159,23167,23173,23189,23197,23201,23203,23209,23227,23251,23269,23279,23291,23293,23297,23311,23321,23327,23333,23339,23357,23369,23371,23399,23417,23431,23447,23459,23473,23497,23509,23531,23537,23539,23549,23557,23561,23563,23567,23581,23593,23599,23603,23609,23623,23627,23629,23633,23663,23669,23671,23677,23687,23689,23719,23741,23743,23747,23753,23761,23767,23773,23789,23801,23813,23819,23827,23831,23833,23857,23869,23873,23879,23887,23893,23899,23909,23911,23917,23929,23957,23971,23977,23981,23993,24001,24007,24019,24023,24029,24043,24049,24061,24071,24077,24083,24091,24097,24103,24107,24109,24113,24121,24133,24137,24151,24169,24179,24181,24197,24203,24223,24229,24239,24247,24251,24281,24317,24329,24337,24359,24371,24373,24379,24391,24407,24413,24419,24421,24439,24443,24469,24473,24481,24499,24509,24517,24527,24533,24547,24551,24571,24593,24611,24623,24631,24659,24671,24677,24683,24691,24697,24709,24733,247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	p = []
	mn = []
	mj = []
	yy = y
	xx = x

	if y in s:
		if y != x and x != 1:
			print(0)
			return
		p.append(int(y))
		mn.append(int(log(x,y)))
		mj.append(1)
	else:
		sq = int(sqrt(y))
		for i in s:
			if i > sq:
				break 
			if y % i == 0:
				p.append(int(i))
				mn.append(log_finder(x,i))
				mj.append(log_finder(y,i))
				yy /= i ** mj[-1]
				xx /= i ** mn[-1]
		if yy != 1:
			p.append(int(yy))
			mj.append(1)
			mn.append(log_finder(x,yy))
			xx /= yy ** mn[-1]
		if xx != 1:
			print(0)
			return
	
	n = 0
	results = set()
	xy = x * y
	for i in range(1<<len(p)):
		mmm = 1
		for j in range(len(p)):
			if ((i & (1 << j)) > 0):
				mmm *= p[j] ** mn[j]
			else:
				mmm *= p[j] ** mj[j]
		nnn = xy / mmm
		if not (mmm > r or mmm < l or nnn > r or nnn < l):
			results.add((min(mmm,nnn), max(mmm,nnn)))
			results.add((max(mmm,nnn), min(mmm,nnn)))
	print(len(results))

function()


import math

l, r, x, y = list(map(int, input().split()))

m = x * y

if l % x == 0:
    low = l
else:
    low = (l // x + 1) * x

cnt = 0
b = min(int(math.sqrt(m)), r)
while low <= b:
    if m % low == 0 and m // low <= r and math.gcd(low, m // low) == x:
        # print(low)
        cnt += 2
    low += x

b = int(math.sqrt(m))
if b >= l and b <= r and b * b == m and math.gcd(b, b) == x:
    cnt -= 1

print(cnt)


n = input()
arr = n.split(' ')
arr = list(map(lambda x: int(x), arr))
l,r,x,y = arr
gcd = x
lcm = y
from math import sqrt
from fractions import gcd
def lcm(a, b):
    """Compute the lowest common multiple of a and b"""
    return int(a * b / gcd(a, b))

ab = x * y
ans = 0
# for a in range(l, r+1):
#     if(a > sqrt(r+1) + 100000):
#         break
#     if(ab % a == 0):
#         b = ab / a
#         if(a > b):
#             break
#         if(l <= b and b <= r and lcm(a,b) == y):
#             if(ab / a == a):
#                 ans += 1
#             else: 
#                 ans += 2
a = x
# while(a % x != 0):
#     a += 1
while(a <= sqrt(ab)):
    b = int(ab / a)
    if(a > b):
        break
    if(ab % a == 0):
        if(l <= b and b <= r and lcm(a,b) == y and l <= a and a <= r):
            if(b == a):
                ans += 1
            else: 
                ans += 2
    a += x

print(ans)