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#include <cstdio>

using namespace std;

typedef long long LL;

LL toMinutesPlain(int d, int h, int m) {
  return (((LL)d * 24) + h) * 60 + m;
}

LL toMinutes(int d, int h, int m) {
  LL res = toMinutesPlain(d, h, m);
  return res >= toMinutesPlain(29, 3, 0) ? res - 60 : res;
}

const LL roundEnds[5] = {
  toMinutes(25, 0, 0),
  toMinutes(26, 0, 0),
  toMinutes(27, 0, 0),
  toMinutes(28, 0, 0),
  toMinutes(30, 0, 0)
};

int main() {
  int x, d, h, m; scanf("%d %d %d %d", &x, &d, &h, &m);
  printf("%lld\n", roundEnds[x-1] - toMinutes(d, h, m));

  return 0;
}