import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		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 in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		if(sum % 9 == 0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}

	}

} Main public static void main(String[] args) {

		Scanner in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		if(sum % 9 == 0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}

	} main {

		Scanner in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		if(sum % 9 == 0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}

	} Scanner in = new Scanner(System.in); in new Scanner(System.in) String n = in.next(); n in.next() in.next in long sum = 0; sum 0 for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		} int i = 0; int i = 0; i 0 i<n.length() i n.length() n.length n i++ i++ i {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		} {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		} int num = n.charAt(i) - '0'; num n.charAt(i) - '0' n.charAt(i) n.charAt n i '0' sum = sum + num sum sum + num sum num 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 in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		if(sum % 9 == 0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}

	}

} public class Main {

	public static void main(String[] args) {

		Scanner in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		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 in = new Scanner(System.in);
		
		String n = in.next();
		
		
		
		long sum = 0;
		
		for(int i = 0;i<n.length();i++) {
			int num = n.charAt(i) - '0';
			sum = sum + num;
		}
		
		
		
		if(sum % 9 == 0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}

	}

}
