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