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

int main(){
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int startMin = d * 24 * 60 + h * 60 + m;
    int endMin = (24 + x + (x == 5)) * 24 * 60;
    if(x == 5 && startMin < 29 * 24 * 60 + 2 * 60 + 30) startMin += 60;
    cout << endMin - startMin << '\n'; 
}