#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int a,b,c,d;
  cin>>a>>b>>c>>d;
  cout<<(a<b and c>d?"YES":"NO")<<endl;
}