import java.io.*;
import java.util.*;

public class Main {
    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static StringTokenizer st;

    public static void main(String[] args) throws IOException {
        char[] cs = br.readLine().toCharArray();

        int ds = 0;
        for (char c : cs) {
            ds += c;
        }
        ds -= cs.length * '0';
        System.out.println(ds % 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