func_code_string: #include <bits/stdc++.h>   using namespace std;   int i, j, n, m, a, b, tmp;   int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); }   int main() {     cin >> n >> m >> a >> b;     tmp = n * m / gcd(n, m);     cout << b / tmp - (a - 1) / tmp;     return 0;   }   