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#include <cstdio>

using namespace std;

int fin[5] = {24, 25, 26, 27, 29};

int main(void){
    int x, d, h, m;
    scanf("%d%d%d%d", &x, &d, &h, &m);
    x--;
    int z = (fin[x] - d)*24*60 + (23-h)*60 + (60-m);
    if (x == 4 && (d < fin[x] || h < 2)) z -= 60;
    printf("%d\n", z);
    return 0;
}