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#include <cstdio>
#include <set>

using namespace std;

int x, d, h, m;

int main() {
  scanf("%d %d %d %d", &x, &d, &h, &m);

  if (x < 5) {
    printf("%d\n", ((23 + x - d) * 24 * 60 + (23 - h) * 60 + 60 - m));
  } else if ((d < 29) || (h < 2)) {
    printf("%d\n", ((29 - d) * 24 * 60 + (23 - h) * 60 - m));
  } else {
    printf("%d\n", ((29 - d) * 24 * 60 + (23 - h) * 60 + 60 - m));
  }

  return 0;
}