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

const int ROUND[5] = {36000, 37440, 38880, 40320, 43200};
const int TIME_LEFT_AFTER_CHANGE = 1260;

const int HOUR = 60;
const int DAY = 24 * HOUR;

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

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

    int time = d * DAY + h * HOUR + m;
    int time_left = ROUND[x - 1] - time;

    if (x == 5 && time_left > TIME_LEFT_AFTER_CHANGE) {
        time_left -= HOUR;
    }

    cout << time_left;
}