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

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int x,d,h,m;
    cin>>x>>d>>h>>m;

    int days[]={0,24,25,26,27,29};
    int day=days[x];

    long long total=(long long)(23-h)*60+(60-m);

    for(int i=d+1; i<=day; i++)
    {
        total+=24*60;
    }

    if(x==5)
    {
        if(d<29 || (d==29 && h<2))
        {
            total-=60;
        }
    }

    cout<<total<<endl;

    return 0;
}