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#include <cstdio>

int main() {
  int x,d,h,m;
  scanf("%d %d %d %d", &x, &d, &h, &m);
  if (d == 29 && h > 2) h--;
  int A = (d-23)*60*24 + h * 60 + m;
  int B = (x+1)*24*60;
  if (x == 5) B += 23*60;
  printf("%d\n", B-A);
  return 0;
}