import java.io.*;
class Main
{
public static void main(String args[])throws IOException
{
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    int x,sum=0;
    String n=br.readLine();
    for(int i=0;i<n.length();i++)
      sum+=n.charAt(i)-'0';
    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