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#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (int i = (a); i < (b); i++)
#define all(x) begin(x), end(x)
#define sz(x) int((x).size())
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

#ifdef LOCAL
auto operator<<(auto& o, auto x) -> decltype(x.first, o);
auto operator<<(auto& o, auto x) -> decltype(x.end(), o) {
  o << "{";
  for (int i = 0; auto y : x) o << ", " + !i++ * 2 << y;
  return o << "}"; }
auto operator<<(auto& o, auto x) -> decltype(x.first, o) {
  return o << "(" << x.first << ", " << x.second << ")"; }
void __print(auto... x) { ((cerr << x << " "), ...) << endl; }
#define debug(x...) __print("[" #x "]:", x)
#else
#define debug(...) 2137
#endif

int main() {
  cin.tie(0)->sync_with_stdio(0);
  int x, d, h, m;
  cin >> x >> d >> h >> m;
  if (d == 29 && h >= 3) h--;
  int mm = d * 60 * 24 + h * 60 + m;
  int pm = (23 + x - 1) * 24 * 60 + 12 * 60;
  int km;
  if (x <= 4) {
    km = (23 + x + 1) * 24 * 60;
  } else {
    km = (29) * 24 * 60 + 23 * 60;
  }
  cout << max(0, km - max(pm, mm)) << '\n';
}