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

int main(){

    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);
    int r, d, h, m; cin >> r >> d >> h >> m;
    if(r == 5){
        int total_time = 59 * 60;
        if(d == 29 && h > 2) total_time -= (36 * 60 + (h - 1) * 60 + m);
        else if(d == 27) total_time -= ((h - 12) * 60 + m);
        else total_time -= ((d - 28) * 24 * 60 +  12 * 60 + h * 60 + m);
        cout << total_time;
    }
    else{
        int total_time = 36 * 60;
        if(d == 23 + r) total_time -= (12 * 60 + h * 60 + m);
        else total_time -= ((h - 12) * 60 + m);
        cout << total_time;
    }
    return 0;
}