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

const int HOUR = 60;

int main(){
    int x,d,h,m; cin >> x >> d >> h >> m;
    if(x<5){
        if(d==22+x) cout << 24 * HOUR + (23-h) * HOUR + (60-m);
        else cout << (23-h) * HOUR + (60-m);
    }
    else{
        if(d==27) cout << 47 * HOUR + (23-h) * HOUR + (60-m);
        else if(d==28) cout << 23 * HOUR + (23-h) * HOUR + (60-m);
        else{
            if(h<2) cout << (1-h) * HOUR  + (60-m) + 21*HOUR;
            else cout << (23-h) * HOUR + (60-m);
        }
    }
}