import java.util.*;
public class Main {

	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		String n =sc.nextLine();
		n.trim();
		int sum=0;
		char line[] = n.toCharArray();
		for(int c : line)
			sum+=c-'0';
		System.out.println(sum%9==0?"Yes":"No");
	}

}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz