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#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    vector<int> tab = {23, 24, 25, 26, 27};
    int k = 2880;
    if(x == 5)
    {
        k += 1440;
    }
    int p = (d-tab[x-1])*1440+h*60+m;
    if(x == 5)
    {
        if(d < 29)
        {
            k -= 60;
        }
        else
        {
            if(h < 2)
            {
                k -= 60;
            }
        }
    }
    cout << k-p;
    return 0;
}