import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String n = sc.next();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%9 == 0){
      		System.out.println("Yes");
        }else{
        	System.out.println("No");
        }
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String n = sc.next();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%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();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%9 == 0){
      		System.out.println("Yes");
        }else{
        	System.out.println("No");
        }
	} main {
		Scanner sc = new Scanner(System.in);
		String n = sc.next();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%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 long soukei = 0; soukei 0 for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        } int i = 0 ; int i = 0 ; i 0 i <=n.length()-1 i n.length()-1 n.length() n.length n 1 i++ i++ i {
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        } {
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        } soukei = soukei + Character.getNumericValue(n.charAt(i)) soukei soukei + Character.getNumericValue(n.charAt(i)) soukei Character.getNumericValue(n.charAt(i)) Character.getNumericValue Character n.charAt(i) n.charAt n i if(soukei%9 == 0){
      		System.out.println("Yes");
        }else{
        	System.out.println("No");
        } soukei%9 == 0 soukei%9 soukei 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();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%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();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%9 == 0){
      		System.out.println("Yes");
        }else{
        	System.out.println("No");
        }
	}
} Main
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String n = sc.next();
        long soukei = 0;

		for(int i = 0 ; i <=n.length()-1 ; i++){
        	soukei = soukei + Character.getNumericValue(n.charAt(i));    	
        }
		
      	if(soukei%9 == 0){
      		System.out.println("Yes");
        }else{
        	System.out.println("No");
        }
	}
}