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#include <iostream>

using namespace std;

void input(int & x, int & d, int & h, int & m) {
    cin >> x >> d >> h >> m;
}

int get_remaining_time(int const x, int const d, int const h, int const m) {
    if(x == 5) {
        int result = ((29-d)*24*60) + ((24-h-1)*60) + (60-m);
        if(d < 29 || h < 2) {
            result -= 60;
        }
        return result;
    } else {
        return ((23+x-d)*24*60) + ((24-h-1)*60) + (60-m);
    }
}

void solve() {
    int x, d, h, m;
    input(x, d, h, m);

    cout << get_remaining_time(x, d, h, m) << "\n";
}

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

    solve();

    return 0;
}