#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;

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