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#include <bits/stdc++.h>
#define FOR(i, l, r) for (int i = (l); i < (r); i++)
#define RFOR(i, l, r) for (int i = (r) - 1; i >= (l); i--)
#define s(x) ((int)(x).size())
#define iter(v) (v).begin(), (v).end()
#define vec vector

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef DEBUG
#define dbg(x) cerr << #x << " = " << (x) << "\n";
#else
#define dbg(x)
#endif

#define pa pair<int, int>
#define ll long long

using namespace std;

void solve()
{
  int x, d, h, m; cin >> x >> d >> h >> m;
  int dzien = 1440;
  if (d - 22 == x and x != 5) {
    cout << dzien  - h * 60 - m + dzien << "\n";
  }
  else if (d - 23 == x and x != 5) {
    cout << dzien - h * 60 - m << "\n";
  }
  else if (d == 27) {
    cout << dzien - h * 60 - m + dzien + dzien - 60 << "\n";
  }
  else if (d == 28) {
    cout << dzien - h * 60 - m + dzien - 60 << "\n";
  }
  else if (d == 29 and h < 2) {
    cout << dzien - h * 60 - m - 60 << "\n";
  }
  else if (d == 29 and h >= 3) {
    cout << dzien - h * 60 - m << "\n";
  }
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
}