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#include <bits/stdc++.h>

using namespace std;

#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(...) {}
#endif

#define x first
#define y second
#define ir(x, a, b) ((a) <= (x) && (x) <= (b))
#define vec vector
#define rep(i, a, b) for (ll i = a; i < (b); ++i)
#define all(x) (x).begin(), (x).end()

using ll = long long;

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

int main() {
  cin.tie(0)->sync_with_stdio(0);
  int x, d, h, m; cin >> x >> d >> h >> m;
  int my = translate(d, h, m);
  int dest = translate(24, 24, 0) + (((x == 5) + x-1) * translate(1, 0, 0));
  if (x == 5 && my < translate(29, 2, 0)) dest -= 60;
  cout << dest - my << "\n";
  return 0;
}