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

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int round, day, hour, minute;
    cin >> round >> day >> hour >> minute;
    vector<int> end_round = {2160, 3600, 5040, 6480, 9300};
    int start_time = (day - 23) * 1440 + (hour - 12) * 60 + minute;
    int change_time = 8040;
    if (start_time >= 8040)
    {
        start_time -= 60;
    }
    int time_left = end_round[round - 1] - start_time;
    cout << time_left << endl;
}