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#include <iostream>

using namespace std;

int main()
{
    int x,d,h,m;
    cin>>x>>d>>h>>m;
    if(x!=5){
        h=24-h-1;
        m=60-m;
        if(d-22-x==0){
            h+=24;
        }
        m+=h*60;
        cout<<m;
        return 0;
    }
    else{
            int h2=h;
        h=24-h-1;

        m=60-m;
        d=d-22-x;
        if(d==0){
            h+=48;
        }
        if(d==1){
            h+=24;
        }
        m+=h*60;
        if(!(d==2&&h2>=2)){
            m-=60;
        }
        cout<<m;
    }
}