#include <iostream>
#include <vector>
#include <algorithm> 
#include <string>
#include <map>
#include <stack>
#include <queue>
using namespace std;
using ll = long long;
#define rep(i, n) for(int i = 0; i < n; ++i)

int main(){
	int a, b, c, d;
	cin >> a >> b >> c >> d;
	
	if(a < b && c > d){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
	
	return 0;
}