import java.util.Scanner;

public  class Main{
	public static void main(String[] args){
	Scanner stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%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