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#include <cstdio>
int main()
{
    int x, d, h, m;
    scanf("%d %d %d %d", &x, &d, &h, &m);
    printf("%d", (576 - h + (x - d) * 24) * 60 - m + (x == 5) * 1440 - (x == 5 && (d < 29 || (d == 29 && h < 3))) * 60);
    return(0);
}