import java.util.*;

public class Main{
    
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int d = sc.nextInt();
        
        if(a<b && c>d){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
        
    }
    
}