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#include <iostream>

using namespace std;
long long x, d, h, m, n;
int main()
{
    cin>>x>>d>>h>>m;

    if(x==1){
        if(d==23){
            n=24*60;
        }
        if(m!=0){
            n=n+(60-m)+(24-h-1)*60;
        }
        else{
            n=n+(24-h)*60;
        }
    }
    if(x==2){
        if(d==24){
            n=24*60;
        }
        if(m!=0){
            n=n+(60-m)+(24-h-1)*60;
        }
        else{
            n=n+(24-h)*60;
        }
    }
    if(x==3){
        if(d==25){
            n=24*60;
        }
        if(m!=0){
            n=n+(60-m)+(24-h-1)*60;
        }
        else{
            n=n+(24-h)*60;
        }
    }
    if(x==4){
        if(d==26){
            n=24*60;
        }
        if(m!=0){
            n=n+(60-m)+(24-h-1)*60;
        }
        else{
            n=n+(24-h)*60;
        }
    }
    if(x==5){
        if(d==27){
            n=24*60*2;
        }
        if(d==28){
            n=24*60;
        }
        if(m!=0){
            n=n+(60-m)+(24-h-1)*60;
        }
        else{
            n=n+(24-h)*60;
        }
        if((d<29)||(d==29 && h<=2)){
            n=n-60;
        }
    }

    cout<<n;

    return 0;
}