Harryxun/stf_run huggingface dataset:
import math
H, W, A, B = map(int,input().split())
def f(a,b):
    p = math.factorial(a+b-2)
    q = math.factorial(a-1)
    r = math.factorial(b-1)
    S = p // (q*r)
return S
T = 0
for i in range(1,H-A):
    P = f(i,B+1)
    Q = f(H-i+1,W-B)
    T = T + P*Q
print(T)

### FIXED CODE ###

import math
H, W, A, B = map(int,input().split())
e = 10**9 + 7
def power(a,b):
    if b == 0:
        return 1
    elif b == 1:
        return a % e
    elif b%2 == 0:
        return power(a,b//2)**2 % e
    else:
        return power(a,b//2)**2*a % e
    
M = [1]
for i in range(1,H+W):
    a = M[i-1]*i%e
    M.append(a)
N= [0]*(H+W)
N[H+W-1] = power(M[H+W-1], e-2)
for i in range(H+W-2, -1, -1):
    N[i] = N[i+1] * (i+1) % e

def c(a,b):
    return M[a]*N[b]*N[a-b]%e

T = 0
for i in range(W-B):
    P = c(H+W-A-i-2,H-A-1)
    Q = c(A+i-1,i)
    T = (T + P*Q)
print(T%e)
N = int(input())
X = int(input())
T = int(input())
if N % X == 0:
  print(N / X * T)
else:
  print(N / X * T + T)

### FIXED CODE ###

N, X, T = map(int, input().split())
if N % X == 0:
  print(int(N / X) * T)
else:
  print(int(N / X + 1) * T)
N = input()
A = int(N[0])
B = int(N[2])

if B % A == 0:
    ans = B - A
else:
    ans = A + B

print(ans)

### FIXED CODE ###

N = input().split(" ")
A = int(N[0])
B = int(N[1])

if B % A == 0:
    ans = B + A
else:
    ans = B - A

print(ans)
N = int(input())
edge = [[] for _ in range(N+1)]
for _ in range(N-1):
    a,b,c = map(int,input().split())
    edge[a].append((b,c))
    edge[b].append((a,c))
Q,K = map(int,input().split())
distance = [-1] * (N+1)
def dfs(v1,d):
    distance[v1] = d
    for v2,dd in edge[v1]:
        if distance[v2] != -1:
            continue
        else:
            dfs(v2,d+dd)

dfs(K,0)
ans = [0] * Q
for i in range(Q):
    x,y = map(int,input().split())
    ans[i] = distance[x]+distance[y]
for a in ans:
    print(a)


### FIXED CODE ###

import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**6)
N = int(input())
edge = [[] for _ in range(N+1)]
for _ in range(N-1):
    a,b,c = map(int,input().split())
    edge[a].append((b,c))
    edge[b].append((a,c))
Q,K = map(int,input().split())
distance = [None] * (N+1)
def dfs(v1,d):
    distance[v1] = d
    for v2,dd in edge[v1]:
        if distance[v2] is not None:
            continue
        dfs(v2,d+dd)

dfs(K,0)

ans = [0] * Q
for i in range(Q):
    x,y = map(int,input().split())
    ans[i] = distance[x]+distance[y]
for a in ans:
    print(a)
T = [1]*(N + 1)
P = [1]*(N + 1)
for i in range(1, N+1):
	P[i] = P[i-1]*2 + 1
	T[i] = T[i-1]*2 + 3
def pate(n, x):
	if n == 0:
		if x > 0: return 1
		return 0
	mid = T[n]//2
	if x < mid:
		return pate(n-1, x-1)
	elif mid == x:
		return 1 + pate(n-1, x-2)
	else:
		return P[n-1] + 1 + pate(n-1, x-mid-1)

print(pate(N, X))


### FIXED CODE ###

N, X = map(int, input().split())
hight, paty = [0]*51, [0]*51
hight[0] = 1
paty[0] = 1

for i in range(1, 51):
	hight[i] = 2*hight[i-1] + 3
	paty[i] = 2*paty[i-1] + 1

def f(n, x):
	if x == 0: return 0
	elif n == 0: return 1

	elif x <= (hight[n-1]+1):
		return f(n-1, x-1)
	else:
		return paty[n-1] + 1 + f(n-1, x-hight[n-1]-2)

print(f(N, X))
n_list = list(input())
n_len_o = len(n_list)
#print(n_list)
a = 0
while(1):
  flag = "ng"
  n_len = len(n_list)
  for i in range(a,n_len-1):
    if n_list[i] != n_list[i+1]:
      n_list.pop(i,i+1)
      if a != 0:
        a = i - 1
      flag = "ok"
      break
  if flag == "ng":
    break
print(n_len_o-len(n_list))

### FIXED CODE ###

n_list = list(input())
n_len_o = len(n_list)
a = 0
while(1):
  flag = "ng"
  n_len = len(n_list)
  for i in range(a,n_len-1):
    if n_list[i] != n_list[i+1]:
      n_list.pop(i)
      n_list.pop(i)
      if i != 0:
        a = i - 1
      else:
        a = 0
      flag = "ok"
      break
  if flag == "ng":
    break
print(n_len_o-len(n_list))
N,M = map(int,input().split())
l=[]
r=[]
for i in range(N):
  a,b=map(int,input().split())
  l.append(a)
  r.append(b)
  
  
ans=min(b)-max(a)+1
print(ans)

### FIXED CODE ###

n,m=map(int,input().split())
l=[list(map(int,input().split())) for i in range(m)]
L=[]
R=[]
for i in range(m):
  L.append(l[i][0])
  R.append(l[i][1])
print(max(min(R)-max(L)+1,0))
X = input()

y = X//500
z = X%500
a = z//5 

A = 1000*y+5*a
print(a)

### FIXED CODE ###

X = input()
X = int(X)
y = X//500
z = X%500
a = z//5 

A = 1000*y+5*a
print(A)
import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")


n = int(input())
a = [list(map(lambda x: int(x)-1, input().split())) for _ in range(n)]
N = n*(n-1)//2
index = {}
ind = 0
from collections import defaultdict
ns = defaultdict(list)
for i in range(n):
    for j in range(i+1,n):
        index[i,j] = ind
        index[j,i] = ind
        ind += 1
for i in range(n):
    for j in range(n-2):
        u = index[i,a[i][j]]
        v = index[i,a[i][j+1]]
        ns[u].append(v)
assert False
### サイクル検出 cycle detection
seen = [False] * N
done = [False] * N
vals = [None] * N
def dfs(u):
    s = [u]
    while s:
        u = s.pop()
        if u>=0:
            # 非負の値: 新しい頂点に到達
            seen[u] = True
            s.append(~u)
            for v in ns[u]:
                if done[v]:
                    continue
                elif not seen[v]:
                    s.append(v)
                else:
                    # 閉路発見
                    return True
        else:
            u = ~u
            done[u] = True
            # ここに帰りがけ処理を書く
            val = 0
            for v in ns[u]:
                # uの子はすべて処理が終わっている
                val = max(val, vals[v]+1)
            vals[u] = val
    return False

ans = -float("inf")
for u in range(N):
    if seen[u]:
        continue
    pos = dfs(u)
    if pos:
        print(-1)
        break
else:
    print(max(vals)+1)

### FIXED CODE ###

import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")


n = int(input())
a = [list(map(lambda x: int(x)-1, input().split())) for _ in range(n)]
N = n*(n-1)//2
index = {}
ind = 0
from collections import defaultdict
ns = defaultdict(list)
for i in range(n):
    for j in range(i+1,n):
        index[i,j] = ind
        index[j,i] = ind
        ind += 1
for i in range(n):
    for j in range(n-2):
        u = index[i,a[i][j]]
        v = index[i,a[i][j+1]]
        ns[u].append(v)
### サイクル検出 cycle detection
seen = [False] * N
done = [False] * N
vals = [None] * N
def dfs(u):
    # uからdfs
    seen[u] = True
    ans = 0
    for v in ns[u]:
        if done[v]:
            ans = max(ans, vals[v]+1)
            continue
        elif seen[v]:
            # サイクルを検出
            return 1
        else:
            pos = dfs(v)
            if pos>=0:
                return 1
            ans = max(ans, vals[v]+1)
    done[u] = True
    vals[u] = ans
    return -1
ans = -float("inf")
for u in range(N):
    if seen[u]:
        continue
    pos = dfs(u)
    if pos>=0:
        print(-1)
        break
else:
    print(max(vals)+1)
# 右と下の両方に#があったら終了だしどちらにもなくても終了
# なんやこのクソみたいな実装は

h, w = map(int, input().split())
table = []
for _ in range(h):
    table.append(input())

flag = False
pos = [0, 0]
while True:
    if pos == [h - 1, w - 1]:
        flag = True
        break
    if h <= pos[0] or w <= pos[1]:
        break
    if (
        pos[0] < h - 1
        and pos[1] < w - 1
        and table[pos[0] + 1][pos[1]] == "#"
        and table[pos[0]][pos[1] + 1] == "#"
    ):
        break
    if pos[0] < h - 1 and pos[1] < w - 1 and table[pos[0] + 1][pos[1]] == "#":
        pos[0] += 1
        continue
    elif pos[0] < h - 1 and pos[1] < w - 1 and table[pos[0]][pos[1] + 1] == "#":
        pos[1] += 1
        continue
    if pos[0] == h - 1 and pos[1] < w - 1 and table[pos[0]][pos[1] + 1] == "#":
        pos[1] += 1
        continue
    elif pos[0] < h - 1 and pos[1] == w - 1 and table[pos[0] + 1][pos[0]] == "#":
        pos[0] += 1
        continue
    else:
        break

print("Possible" if flag else "Impossible")


### FIXED CODE ###

# 右と下の両方に#があったら終了だしどちらにもなくても終了
# なんやこのクソみたいな実装は

h, w = map(int, input().split())
table = []
sharp = 0
for _ in range(h):
    get = input()
    table.append(get)
    sharp += get.count("#")

flag = False
pos = [0, 0]
path = 0
while True:
    if pos == [h - 1, w - 1]:
        path += 1
        flag = True
        break
    if h <= pos[0] or w <= pos[1]:
        break
    if (
        pos[0] < h - 1
        and pos[1] < w - 1
        and table[pos[0] + 1][pos[1]] == "#"
        and table[pos[0]][pos[1] + 1] == "#"
    ):
        break
    if pos[0] < h - 1 and pos[1] < w - 1 and table[pos[0] + 1][pos[1]] == "#":
        pos[0] += 1
        path += 1
        continue
    elif pos[0] < h - 1 and pos[1] < w - 1 and table[pos[0]][pos[1] + 1] == "#":
        pos[1] += 1
        path += 1
        continue
    if pos[0] == h - 1 and pos[1] < w - 1 and table[pos[0]][pos[1] + 1] == "#":
        pos[1] += 1
        path += 1
        continue
    elif pos[0] < h - 1 and pos[1] == w - 1 and table[pos[0] + 1][pos[1]] == "#":
        pos[0] += 1
        path += 1
        continue
    else:
        break

print("Possible" if flag and path == sharp else "Impossible")
invtwos = [1]
i = 0
while abs(invtwos[i]) <= 10**9:
    invtwos.append(invtwos[i]*(-2))
    i += 1
invtwos.append(invtwos[-1]*(-2))

n = int(input())
ans = []
i = 0
while n != 0:
    if n%abs(invtwos[i+1]) != 0:
        ans.append(1)
        n -= invtwos[i]
    else:
        ans.append(0)
    i += 1
ans.reverse()
for i in range(len(ans)):
    if i != len(ans)-1:
        print(ans[i],end="")
    else:
        print(ans[i])

### FIXED CODE ###

invtwos = [1]
i = 0
while abs(invtwos[i]) <= 10**10:
    invtwos.append(invtwos[i]*(-2))
    i += 1
invtwos.append(invtwos[-1]*(-2))

n = int(input())
ans = []
i = 0
while n != 0:
    if n%abs(invtwos[i+1]) != 0:
        ans.append(1)
        n -= invtwos[i]
    else:
        ans.append(0)
    i += 1
ans.reverse()

if len(ans) == 0:
    print("0")
else:
    for i in range(len(ans)):
        if i != len(ans)-1:
            print(ans[i],end="")
        else:
            print(ans[i])
X = int(input().split()[0])
Y = int(input().split()[1])
c = (4*X-Y)/2
t = (Y-2*X)/2
if c >= 0 and int(c) == c:
    if t >= 0 and int(t) == t:
        print("Yes")
    else:
        print("No")
else:
    print("No")

### FIXED CODE ###

XY = input().split()
X = int(XY[0])
Y = int(XY[1])
c = (4*X-Y)/2
t = (Y-2*X)/2
if c >= 0 and int(c) == c:
    if t >= 0 and int(t) == t:
        print("Yes")
    else:
        print("No")
else:
    print("No")
# https://atcoder.jp/contests/abc150/tasks/abc150_b
import sys
def read_int(): return int(input())
def read_str_n(): return list(map(str, input().split()))

def error_print(*args): print(*args, file=sys.stderr)
def mt(f):
    import time
 
    def wrap(*args, **kwargs):
        s = time.time()
        ret = f(*args, **kwargs)
        e = time.time()
 
        error_print(e - s, 'sec')
        return ret
 
    return wrap



__DEBUG__ = False

if __DEBUG__:
    N = 33
    S = list('ABCCABCBABCCABACBCBBABCBCBCBCABCB')
else:
    N = read_int()
    S = read_str_n()

@mt
def solution():
    count = 0    
    for i in range(N-2):
        if __DEBUG__: print(f"checking {S[i]} at index: {i}")
        if S[i] == 'A':
            if S[i+1] == 'B' and S[i+2] == 'C':
                count += 1
                continue
    
    
    print(f"{count}")
    
if __name__ == '__main__':
    solution()


### FIXED CODE ###

N = int(input())
S = str(input())
 


count = 0    
for i in range(N-2):
  if S[i] == 'A':
    if S[i+1] == 'B' and S[i+2] == 'C':
      count += 1
    
print(count)
n=int(input("the number you can use",":"))

print(n**3)

### FIXED CODE ###

N=int(input())
print(N**3)
p=input()
if p[len(p)-1]=='s':
  p.append('es')
  print(p)
else:
  p.append('s')
  print(p)
  

### FIXED CODE ###

p =input()
if p[len(p) - 1] == 's':
    print(p+'es')
else:
    print(p+'s')
a,b = map(int,imput().split()) 
 
c = a*b  
if c%2 == 0 :
    print("Even")
else:
    print ("Odd")

### FIXED CODE ###

a,b = map(int,input().split()) 
 
c = a*b  
if c%2 == 0 :
    print("Even")
else:
    print ("Odd")
from decimal import Decimal

n = int(input())
a = list(map(int, input().split()))

ans = 1
for i in a:
    ans = Decimal(str(ans * i))

print(ans) if ans <= Decimal(str(10 ** 18)) else print(-1)


### FIXED CODE ###

n = int(input())
a = list(map(int, input().split()))

if 0 in a:
    print(0)
else:
    ans = 1
    for i in a:
        ans *= i
        if ans > 10 ** 18:
            print(-1)
            exit()

    print(ans)
n, m = map(int, input().split())
a = list(map(int, input().split()))
a.sort(reverse = True)

cnt = 0
while cnt < m:
    if a[0] // 2 < a[1]:
        a[0] = a[0] // 2
        cnt += 1
        a.sort(reverse = True)
    else:
        a[0] = a[0] // 2
        cnt += 1
print(sum(a))

### FIXED CODE ###

import sys
import heapq
input = sys.stdin.readline
 
n, m = map(int, input().split())
a = list(map(int, input().split()))
for i in range(n):
    a[i] *= -1
heapq.heapify(a)
 
for cnt in range(m):
    temp = heapq.heappop(a)*(-1)
    if temp == 0:
        break
    heapq.heappush(a, (temp//2)*(-1))
    
print(sum(a)*(-1))
H, W = map(int, input().split())
lis=[["."]*(W+2)]
for i in range(H):
    lis+=[["."]+list(input())+["."]]
lis += [["."]*(W+2)]
for w in range(1, H+1):
    for h in range(1, W+1):
        x=0
        if lis[h][w] == ".":
            if lis[h+1][w-1] == "#":
                x += 1
            if lis[h+1][w] == "#":
                x += 1
            if lis[h+1][w+1] == "#":
                x += 1
            if lis[h][w-1] == "#":
                x += 1
            if lis[h][w+1] == "#":
                x += 1
            if lis[h-1][w-1] == "#":
                x += 1
            if lis[h-1][w] == "#":
                x += 1
            if lis[h-1][w+1] == "#":
                x += 1
            lis[h][w] = x
lis=lis[1:-1]
for i in lis:
    print(*i[1:-1], sep="")
print("")

### FIXED CODE ###

h, w = map(int, input().split())
S=[]
S.append(["."] * (w + 2))
for i in range(h):
  S.append(["."] + list(input()) + ["."])
S.append(["."] * (w + 2))
 
 
for i in range(1, h+1):
  for j in range(1, w+1):
    counter = 0
    if S[i][j] == ".":
      if S[i-1][j-1] == "#":
        counter += 1
      if S[i-1][j] == "#":
        counter += 1
      if S[i-1][j+1] == "#":
        counter += 1
      if S[i][j-1] == "#":
        counter += 1
      if S[i][j+1] == "#":
        counter += 1
      if S[i+1][j-1] == "#":
        counter += 1
      if S[i+1][j] == "#":
        counter += 1
      if S[i+1][j+1] == "#":
        counter += 1
      S[i][j] = counter
 
for i in range(1,h+1):
  for j in range(1, w+1):
    print(S[i][j], end="")
  print()
import math
phi = (1 + math.sqrt(5)) / 2

def counter(n):
    if n == 0:
        return 0
    else:
        f = round(phi**(n) / math.sqrt(5)) % (10**9+7)
        return f
N, M = map(int, input().split())
a = [int(input()) for _ in range(M)]
a.append(N+1)
if M == 0:
    print(counter(N+1))
    exit()
ans = counter(a[0])
for i in range(1,M+1):
    ans = (ans * counter(a[i]-a[i-1]-1)) % (10**9+7)
#ans = ans * round(phi**(N-a[-1]) / math.sqrt(5)) % (10**9+7)
print(ans)

### FIXED CODE ###

def fib(n):
    if n == 1 or n == 2:
        return 1
    else:
        a = 1
        b = 0
        for _ in range(n-1):
            (a, b) = (a+b, a)
        return a % (10 ** 9 + 7)


def counter(n):
    if n == 0:
        return 0
    else:
#        f = round(phi**(n) / math.sqrt(5)) % (10**9+7)
        return fib(n)


N, M = map(int, input().split())
a = [int(input()) for _ in range(M)]
if M == 0:
    print(counter(N+1))
    exit()
a.append(N+1)
ans = counter(a[0])
for i in range(1,M+1):
    ans = (ans * counter(a[i]-a[i-1]-1)) % (10**9+7)
print(ans)
import numpy as np


def main():
    N,K=map(int,input().split())
    A=list(map(int,input().split()))


    for _ in range(K):
        counter=[0 for _ in range(N)]

        for i in range(len(A)):
            left=max(0,i-A[i])
            right=min(N-1,i+A[i])
            counter[left]+=1
            if right+1<N:
                counter[right+1]-=1
        for i in range(len(counter)-1):
            counter[i+1]+=counter[i]

        if counter==A:
            break
        else:
            A=counter

    print(A)

if __name__ == "__main__":
    main()


### FIXED CODE ###

def main():
    N,K=map(int,input().split())
    A=list(map(int,input().split()))


    for _ in range(K):
        counter=[0 for _ in range(N)]

        for i in range(len(A)):
            left=max(0,i-A[i])
            right=min(N-1,i+A[i])
            counter[left]+=1
            if right+1<N:
                counter[right+1]-=1
        for i in range(len(counter)-1):
            counter[i+1]+=counter[i]

        if counter==A:
            break
        else:
            A=counter

    for i in range(N):
        if i!=N-1:
            print(str(A[i])+" ",end="")
        else:
            print(A[i])

if __name__ == "__main__":
    main()
from collections import deque

N = deque(input())
Q = int(input())
Qs = []
for _ in range(Q):
    Qs.append(list(map(str, input().split())) ) 
k=0
for q in Qs:
    if q[0] == '1':
        k+=1
    else:
        if k%2 ==0:
            if q[1]=='1':
                N.appendleft(q[2])
            else:
                N.append(q[2])
        else:
            if q[1]=='2':
                N.appendleft(q[2])
            else:
                N.append(q[2])
if k%2==1:
    ans=''
    for x in N.rotate():
        ans += x
else:
    ans=''
    for x in N:
        ans += x
        
print(ans)


### FIXED CODE ###

from collections import deque

N = deque(input())
Q = int(input())
Qs = []
for _ in range(Q):
    Qs.append(list(map(str, input().split())) ) 
k=0
for q in Qs:
    if q[0] == '1':
        k+=1
    else:
        if k%2 ==0:
            if q[1]=='1':
                N.appendleft(q[2])
            else:
                N.append(q[2])
        else:
            if q[1]=='2':
                N.appendleft(q[2])
            else:
                N.append(q[2])
if k%2==1:
    ans=''
    for x in reversed(N):
        ans += x
else:
    ans=''
    for x in N:
        ans += x

print(ans)
#n = int(input())
a,b = map(str,input().split())
#A = list(map(int,input().split()))
ans = (a-1)*(b-1)

print(ans)

### FIXED CODE ###

a,b = map(int,input().split())
#A = list(map(int,input().split()))
ans = (a-1)*(b-1)
 
print(ans)
x = int(input())
if x%11 > 6:
    ans = x//11 *2 +2
elif x %11==0:
    pass
else:
    ans = x//11 *2 +1
print(ans)

### FIXED CODE ###

x = int(input())
ans = x // 11 * 2
if x % 11 >= 7:
    ans += 2
elif x % 11 == 0:
    pass
else:
    ans += 1
print(ans)
n, m =  map(int, input().split())
py = [map(int, input().split()) for _ in range(m)]
p, y = [list(i) for i in zip(*py)]
pre = {}
for i in range(m):
    if p[i] not in pre.keys():
        pre[p[i]] = []
    pre[p[i]].append(y[i])
for i in pre.keys():
    pre[i].sort()
for i in range(m):
    num = str(p[i]*(10**6)+(pre[p[i]].index(y[i])+1))
    while len(num) < 12:
        num = '0' + num
    print(num)

### FIXED CODE ###

import sys
x,y = map(int, sys.stdin.readline().rstrip("\n").split())
print(x+y//2)
N = int( input() )

for i in range( int(N**0.5)+1 ):
    ans = max( ans, i*i )

print( ans )

### FIXED CODE ###

N = int( input() )

ans = 0
for i in range( int(N**0.5)+1 ):
    ans = max( ans, i*i )

print( ans )
# -*- coding: utf-8 -*-
import sys
# ----------------------------------------------------------------
# Use Solve Function

def solve(lines):
    N = int(lines.pop(0))
    L = list(map(int, lines.pop(0).split(' ')))
    L.sort()
    print(L[-1] - L[0])

#
# main
#

# 1. use list instead of stdin

# contents = '''\
# 4
# 1 4 6 3\
# '''
# lines = contents.split('\n')

# 2. use stdin

# lines = [x.strip() for x in sys.stdin.readlines()]

#
# solve !!
#
solve(lines)

### FIXED CODE ###

# -*- coding: utf-8 -*-
import sys
# ----------------------------------------------------------------
# Use Solve Function

def solve(lines):
    N = int(lines.pop(0))
    L = list(map(int, lines.pop(0).split(' ')))
    L.sort()
    print(L[-1] - L[0])

#
# main
#

# 1. use list instead of stdin

# contents = '''\
# 4
# 1 4 6 3\
# '''
# lines = contents.split('\n')

# 2. use stdin

lines = [x.strip() for x in sys.stdin.readlines()]

#
# solve !!
#
solve(lines)
a, b = map(int, input().split())
ans = int(((b-a)*(b-a+1)/2)-b)
print(ans)

### FIXED CODE ###

n = int(input())
if n > 999:
    print("ABD")
    exit()
print("ABC")
from math import hypot
def dijkstra(matrix):
    from heapq import heappush, heappop
    n = len(matrix)
    inf = 10**10
    hq = []
    ans = [inf]*n
    ans[0] = 0
    heappush(hq, (0, 0))
    while hq:
        d, p = heappop(hq)
        for i in range(n):
            if ans[p] == d and p != i and d + matrix[p][i] < ans[i]:
                ans[i] = d + matrix[p][i]
                heappush(hq, (ans[i], i))
    return ans[n-1]

x_s, y_s, x_t, y_t = map(int, input().split())
N = int(input())
xyr = [(x_s,y_s,0)]
for i in range(N):
    xyr.append(tuple(int(i) for i in input().split()))
xyr.append((x_t,y_t,0))
graph = [[0]*(N+2) for j in range(N+2)]

for i in range(N+2):
    for j in range(i,N+2):
        graph[i][j] = max(hypot((xyr[i][1]-xyr[j][1]), (xyr[i][0]-xyr[j][0])) - xyr[i][2] - xyr[j][2], 0)
        graph[j][i] = graph[i][j]

print(dijkstra(graph))

### FIXED CODE ###

N, x = map(int, input().split())
a = [int(i) for i in input().split()]
ans = 0
for i in range(N-1):
	if a[i] + a[i+1] > x:
		d = a[i] + a[i+1] - x
		if d <= a[i+1]:
			a[i+1] -= d
			ans += d
		else:
			a[i] -= d - a[i+1]
			a[i+1] = 0
			ans += d
print(ans)
import sys

n, m = map(int, input().split())
if m == 0:
    print(1)
    sys.exit()

array = [[int(x) for x in input().split()] for x in range(m)]

adjacency_list = [[] for x in range(m + 1)]

for i in array:
    adjacency_list[i[0]].append(i[1])
    adjacency_list[i[1]].append(i[0])

searched = [False for x in range(m+1)]


def calc(start, maze, searched):
    res = 0
    if searched[start]:
        return 0
    searched[start] = True

    if searched.count(True) == n:
        return 1
    else:
        for next in maze[start]:
            res += calc(next, maze, list(searched))
    return res


print(calc(1, adjacency_list, searched))


### FIXED CODE ###

import sys

n, m = map(int, input().split())

array = [[int(x) for x in input().split()] for x in range(m)]

if m == 0:
    print(0)
    sys.exit()

adj_array = [[] for x in range(n + 1)]
res_array = [True] + [False for x in range(n)]
for item in array:
    adj_array[item[0]].append(item[1])
    adj_array[item[1]].append(item[0])


def dfs(n, res_array, res):
    res_array[n] = True
    if False not in res_array:
        return res+1
    else:
        for next in adj_array[n]:
            if not res_array[next]:
                res = dfs(next, list(res_array), res)
    return res


res = 0
res_array[1] = True
print(dfs(1, res_array, res))