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

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    }
} import java.util.*; util.* java import java.io.*; io.* java import java.lang.*; lang.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    } main {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int ans = 0; ans 0 for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        } int i = 0; int i = 0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
            ans += Character.getNumericValue(s.charAt(i));
        } {
            ans += Character.getNumericValue(s.charAt(i));
        } ans += Character.getNumericValue(s.charAt(i)) ans Character.getNumericValue(s.charAt(i)) Character.getNumericValue Character s.charAt(i) s.charAt s i if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No"); ans % 9 == 0 ans % 9 ans 9 0 System.out.println("Yes") System.out.println System.out System System.out "Yes" System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    }
} Main
import java.util.*;
import java.io.*;
import java.lang.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int ans = 0;

        for (int i = 0; i<s.length();i++){
            ans += Character.getNumericValue(s.charAt(i));
        }

        if (ans % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");

    }
}
