#include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, ta, tb;     cin >> a >> ta >> b >> tb;     int t, m;     char c;     cin >> t >> c >> m;     m += 60 * t;     int cur = 5 * 60;     int res = 0;     while (cur < 24 * 60) {       if (min(cur + tb, m + ta) > max(cur, m)) ++res;       cur += b;     }     cout << res;   }   