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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  vector<int> a(4);
  rep(i,4) cin >> a[i];
  if (a[0] < a[1] && a[2] > a[3]) cout << "YES" << endl;
  else cout << "NO" << endl;


}