import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 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 N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 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 N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 9 == 0) {
			System.out.println("Yes");

		}else {
			System.out.println("No");
		}

	} main {
		Scanner sc = new Scanner(System.in);
		String N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 9 == 0) {
			System.out.println("Yes");

		}else {
			System.out.println("No");
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String N = sc.next(); N sc.next() sc.next sc int check_dev9 = 0; check_dev9 0 for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		} int i=0; int i=0; i 0 i<N.length() i N.length() N.length N i++ i++ i {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		} {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		} check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1) check_dev9 check_dev9 + (int)(N.charAt(i) - '1' +1) check_dev9 (int)(N.charAt(i) - '1' +1) N.charAt(i) - '1' N.charAt(i) N.charAt N i '1' 1 if(check_dev9 % 9 == 0) {
			System.out.println("Yes");

		}else {
			System.out.println("No");
		} check_dev9 % 9 == 0 check_dev9 % 9 check_dev9 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 N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 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 N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 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 N = sc.next();
		int check_dev9 = 0;
		for(int i=0;i<N.length();i++) {
			check_dev9 = check_dev9 + (int)(N.charAt(i) - '1' +1);
		}

		if(check_dev9 % 9 == 0) {
			System.out.println("Yes");

		}else {
			System.out.println("No");
		}

	}

}