import java.util.*;


class Main {
    public static void main(String[] args) {
   		Scanner sc=new Scanner(System.in);
   		int num=0;
   		if(sc.nextInt()<sc.nextInt())num++;
   		if(sc.nextInt()>sc.nextInt())num++;
   		if(num>1)System.out.println("YES");
   		else System.out.println("NO");
   		sc.close();
   		return;
    }
}