import java.util.Arrays;
import java.util.Scanner;
public class Main{
	public static void main(String[] args)throws Exception{
		new Main().solve();
	}
	void solve(){
		Scanner sc=new Scanner(System.in);
		int[] d=new int[7];
		for(int i=0;i<7;i++){
			d[i]=sc.nextInt();
		}
		Arrays.sort(d);
		int count=1;
		int countM=1;
		for(int i=0;i<6;i++){
			if(d[i]==d[i+1]){
				count++;
				countM=Math.max(countM, count);
			}else{
				count=0;
			}
		}
		if(countM>=3){
			System.out.println("NO");
		}else{
			System.out.println("YES");
		}
	}
}