#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000000

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;
}