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#include <cstdio>

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

  if (x == 5) {
    if (d < 29 || (d == 29 && h < 2)) {
      ++h;
    }
  }

  int ed = 23 + x;
  if (x == 5) {
    ++ed;
  }

  int eh = 23, em = 59;

  int result = 0;

  while (d < ed) {
    result += 24 * 60;
    ++d;
  }

  while (h < eh) {
    result += 60;
    ++h;
  }
  
  while (m <= em) {
    ++result;
    ++m;
  }

  printf("%d\n", result);
}