#include <bits/stdc++.h> using namespace std; int dem(long int a, long int b, long int c, long int d) { int lcm = (c * d) / __gcd(c, d); int dema = (a - 1) / lcm; int demb = b / lcm; return demb - dema; } int main() { long int a,b,c,d; cin >> a >> b >> c >> d; cout << dem(a,b,c,d); return 0; }
