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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 answer = 0;
    int end_day = x + 23 + (x == 5);

    while (d <= end_day) {
        answer++;
        m++;
        if (m == 60) {
            h++;
            m = 0;
        }
        if (d == 29 && h == 2) {
            h = 3;
        }
        if (h == 24) {
            d++;
            h = 0;
        }
    }
    cout << answer;
}