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#include<bits/stdc++.h>
using namespace std;
int main()
{
    int x,d,h,m;
    cin>>x>>d>>h>>m;
    if(x<5)
    {
        if((x+d)%2==0)
        {
            cout<<(24-h)*60-m+60*24;
        }
        else cout<<(24-h)*60-m;
    }
    else{
        if(d==27)
        {
            cout<<(24-h)*60-m+60*24+60*23;
        }
        else if(d==28)
        {
            cout<<(24-h)*60-m+60*23;
        }
        else
        {
            if(h>=3)
            {
                cout<<(24-h)*60-m;
            }
            else cout<<(24-h-1)*60-m;
        }
    }
}