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

int finish_time[5] = {
    25 * 1440,
    26 * 1440,
    27 * 1440,
    28 * 1440,
    30 * 1440
};

int time_change = 29 * 1440 + 2 * 60;

int main() {
    int x, d, h, m; scanf("%d%d%d%d", &x, &d, &h, &m);
    int start = d * 1440 + h * 60 + m;
    int finish = finish_time[x - 1];
    if(x <= 4)
        printf("%d\n", finish - start);
    else {
        if(start < time_change) printf("%d\n", finish - start - 60);
        else printf("%d\n", finish - start);
    }
    return 0;
}