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


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

    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int start = d * 24 * 60 + h * 60 + m;
    int end = (24 + x + int(x == 5)) * 60 * 24 - 1;
    int ans = end - start + 1;
    if (x == 5 && start <= 29 * 24 * 60 + 2 * 60) ans -= 60;
    cout << ans << '\n';
}