#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

void solve() {
  ll a, b, c, d;
  cin >> a >> b >> c >> d;
  ll rem = 31 - a + b, ans = 3;
  if (rem >= c) {
    ans = 1;
  } else if (rem >= d) {
    ans = 2;
  }
  cout << ans << '\n';
}

int main() {
  std::cin.tie(nullptr);
  std::ios_base::sync_with_stdio(false);
  int T = 1;
  for (int t = 0; t < T; t++) {
    solve();
  }
  return 0;
}