import java.util.*;
class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  char c[]=sc.next().toCharArray();
  int ans=0;
  for(int i=0;i<c.length;i++){
    ans+=(c[i]-'0');
  }System.out.println(ans%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