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#include <bits/stdc++.h>

using namespace std;

int main(){

    int x,d,h,m;
    int wyn=0;

    cin>>x>>d>>h>>m;
    wyn += 60-m;
    if(x<5){
        if(d==22+x){
            wyn+=24*60;
        }
    }else{
        if(d==27){
            wyn+=2*24*60;
            wyn -= 60;
        }else if(d==28){
            wyn+=24*60;
            wyn -= 60;
        }else{
            if(h<2) wyn-=60;
        }
    }
    wyn+=(23-h)*60;
    cout<<wyn;

}