/**
*    author:  yuya1234
*    created: 10.07.2020 21:20:31
**/

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

#define REP(i,n) for(ll i=0;i<(ll)(n);i++)
#define REPD(i,n) for(ll i=n-1;i>=0;i--)
#define FOR(i,a,b) for(ll i=a;i<=(ll)(b);i++)
#define FORD(i,a,b) for(ll i=a;i>=(ll)(b);i--)

#define ALL(x) x.begin(),x.end()
#define SORT(x) sort(x.begin(),x.end())
#define SORTD(x) sort(x.rbegin(),x.rend())
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
#define SZ(x) ll(x.size())

#define MEMSET(v, h) memset((v), h, sizeof(v))

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  int a[4];
  cin>>a[0]>>a[1]>>a[2]>>a[3];

  if(a[0]<a[1] && a[2]>a[3])cout<<"YES"<<endl;
  else cout<<"NO"<<endl;

  return 0;
}