#include<bits/stdc++.h>
using namespace std;

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	int a[4]; for(int i=0;i<4;++i)cin>>a[i];
	cout<<(a[0]<a[1]&&a[2]>a[3]?"YES"s:"NO"s)<<"\n"s;
}