import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
    	char[] n = sc.next().toCharArray();
    	int sum = 0;
    	for(int i = 0; i < n.length; i++){
        	sum += Character.getNumericValue(n[i]);
        }

      	if(sum%9==0) System.out.println("Yes");
      	else System.out.println("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