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

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	}
} import java.util.Scanner; Scanner java.util import java.util.*; util.* java public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	} main {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String N = scan.next(); N scan.next() scan.next scan scan.close() scan.close scan int sum = 0; sum 0 for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		} int i = 0 ; int i = 0 ; i 0 i < N.length() i N.length() N.length N i++ i++ i {
			sum += Integer.parseInt(N.substring(i,i+1));
		} {
			sum += Integer.parseInt(N.substring(i,i+1));
		} sum += Integer.parseInt(N.substring(i,i+1)) sum Integer.parseInt(N.substring(i,i+1)) Integer.parseInt Integer N.substring(i,i+1) N.substring N i i+1 i 1 System.out.println(sum%9 == 0?"Yes":"No") System.out.println System.out System System.out sum%9 == 0?"Yes":"No" sum%9 == 0 sum%9 sum 9 0 "Yes" "No" String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	}
} public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	}
} Main
import java.util.Scanner;
import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();

		int sum = 0;

		for (int i = 0 ;i < N.length() ;i++ ) {
			sum += Integer.parseInt(N.substring(i,i+1));
		}

		System.out.println(sum%9 == 0?"Yes":"No");
	}
}
