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

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

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

    int fist_day[] = {-1, 23, 24, 25, 26, 27};

    int mins = 0;

    if (x != 5) {
        if (d != fist_day[x]) {
            mins = 60 * (23-h) + (60 - m);
        } else {
            mins = 60 * (23-h) + (60 - m) + 24 * 60;
        }
    } else {
        if (d == 29 && h >= 3) {
            mins = 60 * (23-h) + (60 - m);
        } else {
            mins = 60 * (23-h) + (60 - m) + (24 * (29 - d)) * 60 - 60;
        }
    }

    cout << mins;
    
    return 0;
}