import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

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



    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

        if (sum % 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.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

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



    } main {

        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

        if (sum % 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.nextLine(); s sc.nextLine() sc.nextLine sc char[] chars = s.toCharArray(); chars s.toCharArray() s.toCharArray s int sum = 0; sum 0 for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        } int i = 0; int i = 0; i 0 i <chars.length i chars.length chars chars.length i++ i++ i {
            sum += Character.getNumericValue(chars[i]);
        } {
            sum += Character.getNumericValue(chars[i]);
        } sum += Character.getNumericValue(chars[i]) sum Character.getNumericValue(chars[i]) Character.getNumericValue Character chars[i] chars i if (sum % 9 == 0) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } sum % 9 == 0 sum % 9 sum 9 0 {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
            System.out.println("No");
        } 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.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

        if (sum % 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.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

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



    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();

        char[] chars = s.toCharArray();

        int sum = 0;
        for (int i = 0; i <chars.length; i++) {
            sum += Character.getNumericValue(chars[i]);
        }

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



    }
}