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#include <iostream>
using namespace std;

int dane[5] = {24, 25, 26, 27, 29};

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

    int x, d, h, m;
    cin >> x >> d >> h >> m;

    if(x != 5){
        if(dane[x-1] != d){
            d = 1;
            h = (23-h);
            m = (60-m);
        }else{
            d = 0;
            h = (23-h);
            m = (60-m);
        }
    }else{
        if(d == 27){
            d = 2;
            h = (23-h)-1;
            m = (60-m);
        }else if(d == 28){
            d = 1;
            h = (23-h)-1;
            m = (60-m);
        }else{
            d = 0;
            if(h >= 3){
                h = (23-h);
                m = (60-m);
            }else{
                h = (23-h)-1;
                m = (60-m);
            }
        }
    }

    //cout << d << " " << h << " " << m << '\n';
    cout << ((d*24*60)+(h*60)+m) << '\n';
}