import java.util.Scanner;

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