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

int main(){
    int x, d, h, m, wyn;
    cin >> x >> d >> h >> m;
    wyn = (23 - h)* 60 + (60 - m);
    if (x < 5){
        wyn = wyn + (23 + x - d)*60*24;
    }
    else {
        wyn = wyn + (29 - d)*60*24;
        if (d < 29 || (d == 29 && h < 2)) wyn = wyn - 60;
    }

    cout << wyn;


  return 0;
}