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#include <stdio.h>

int main() {
    int x, d, h, m, res=0;
    int all_day = 24 * 60;
    scanf("%d%d%d%d", &x, &d, &h, &m);
    res = 60 * (24 - (h+1)) + 60 - m; // to midnight
    if (d == 22 + x) // first day of round
        res += all_day;
    if (x == 5 && (d == 27 || d == 28))
        res += all_day - 60;
    if (d == 29 && h <= 2)
        res -= 60;

    printf("%d\n", res);
    return 0;
}