#include <bits/stdc++.h>
using namespace std;

#define loop(i, a, b) for(int i = a; i <= b; i++)
#define loop_rev(i, a, b) for(int i = a; i >= b; i--)
#define all(x) x.begin(), x.end()
#define sz(x) int(x.size())
#define eb emplace_back
#define pb push_back

using ui = uint32_t;
using ll = int64_t;

int main() {
  cin.tie(0)->sync_with_stdio(0);
  int x, d, h, m; cin >> x >> d >> h >> m;

  int end[] = { 0, 24, 25, 26, 27, 29 };

  int days_left = end[x] - d + 1;
  int minutes_left = days_left * 24 * 60 - h * 60 - m;

  if(x == 5 && !(d == 29 && h * 60 + m > 2 * 60))  {
    minutes_left -= 60;
  }

  cout << minutes_left << '\n';

}