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

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

    int r, d, g, m, res = 0;
    cin >> r >> d >> g >> m;

    d -= 23;

    if(r < 5){
        res = (24 - g) * 60 - m + (r - d) * 24 * 60 ;
    }
    else{
        res = (24 - g) * 60 - m + (r - d + 1) * 24 * 60;
        if(!(d == 6 && g >= 3)) res -= 60;
    }
    cout << res << '\n';
}