#include <bits/stdc++.h>
using namespace std;
#define rep(i,l,r) for(int i=(l);i<(r);++i)
typedef long long ll;

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