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

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int x,d,g,m;
    cin >> x >> d >> g >> m;
    if (x<=4)
    {
        cout << (23+x-d)*24*60+24*60-g*60-m;
    }
    if (x==5)
    {
        if (d<=28 or g<=1)
            cout << (29-d)*24*60+24*60-g*60-m-60;
        else
            cout << (29-d)*24*60+24*60-g*60-m;
    }
}