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

void solve() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  cout << ((a < b && c > d) ? "YES" : "NO") << endl;
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  solve();
  getchar();
}