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

int main() {

    int x,d,h,m;
    cin>>x>>d>>h>>m;
    vector<int> daty = {24,25,26,27,29};
    cout<< (daty[x-1]-d)*24*60  + (23-h)*60 - (x==5 && (d<29 || h<2))*60 + (60-m);

}