#include <bits/stdc++.h>
#define int long long
#define double long double
using namespace std;
const int MOD = 1000000007;
const int INF = 1e14;
using Graph = vector<vector<int>>;

signed main(){
  int A,B,C,D;
  cin >> A >> B >> C >> D;
  if( A<B && C>D ) cout << "YES" << endl;
  else cout << "NO" << endl;
}