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

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    ll x, d, h, m;
    cin >> x >> d >> h >> m;

    int end_day[] = {0, 24, 25, 26, 27, 29};
    int ed = end_day[x];

    ll mins;
    if (d == 29 && h < 2) {
        mins = 23 * 60 - h * 60 - m;
    } else {
        mins = 24 * 60 - h * 60 - m;
    }

    for (int day = d + 1; day <= ed; day++) {
        mins += (day == 29) ? 23 * 60 : 24 * 60;
    }

    cout << mins << endl;
    return 0;
}