Problem:
Score : 300 points

Problem Statement

You are given four integers A, B, C, and D. Find the number of integers between A and B (inclusive) that can be evenly divided by neither C nor D.

Constraints

1\leq A\leq B\leq 10^{18}

1\leq C,D\leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B C D

Output

Print the number of integers between A and B (inclusive) that can be evenly divided by neither C nor D.

Sample Input 1

4 9 2 3

Sample Output 1

2

5 and 7 satisfy the condition.

Sample Input 2

10 40 6 8

Sample Output 2

23

Sample Input 3

314159265358979323 846264338327950288 419716939 937510582

Sample Output 3

532105071133627368

Solution in Python (3.4.3) (judge verdict: Wrong Answer)

from fractions import gcd
a,b,c,d=map(int,input().split())
def lcm(n,m):
    return (n*m)//gcd(n,m)
cntb=b-(b//c)-(b//d)+(b//lcm(c,d))
cnta=a-1-(a-1)//c-((a-1)//d)+((a-1)//lcm(c,d))
ans=cntb+cnta
print(ans)