import java.util.Scanner;

public class Main {
    public static void main(String[] args)
    {
        Scanner inputs = new Scanner(System.in);
        String n = inputs.next();
        int sum = 0;
        for(char ch: n.toCharArray())
            sum += Character.getNumericValue(ch);

        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