#include <iostream>
using namespace std;

int
main() {
  int n, h, m, t;
  cin >> n >> h >> m >> t;
  n--;
  while (n-- > 0) {
    m += t;
    while (m >= 60) {
      m -= 60-m; h++;
    }
  }
    if (h >= 24) h %= 24;
    return 0;
}