#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <iomanip>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 
#define RETURN( LL , ANSWER ) LL answer_for_contest = ( ANSWER ); cout << answer_for_contest << endl; return 0;
int main()
{

  CIN( ll , A1 );
  CIN( ll , A2 );
  CIN( ll , A3 );
  CIN( ll , A4 );
  RETURN( string , A1 < A2 && A3 > A4 ? "YES" : "NO" );

}