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#include<bits/stdc++.h>
using namespace std;
int main(){
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int xx = 0;
    if(d == 29 && h > 2)xx = - 60;
    d -= (22 + x);
    if(x == 5){
        if(d == 0)cout << 3540 - ((h - 12) * 60 + m + xx) << '\n';
        else if(d == 1)cout << 3540 - (12 * 60 + h * 60 + m + xx) << '\n';
        else cout << 3540 - ((12 + 24) * 60 + h * 60 + m + xx) << '\n';
    }
    else{
    if(d == 0){
        cout << 2160 - ((h - 12) * 60 + m + xx) << '\n';
    }
    else cout << 2160 - (12 * 60 + h * 60 + m + xx) << '\n';
    }
}