#include <bits/stdc++.h> 
using namespace std;
#include <stdio.h>
#include <iomanip>
#include <iostream>
#include <string>
#include <algorithm>

int main(){
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if(a<b&&c>d){
    cout << "YES";
  }
  else{
    cout << "NO";
  }
}