import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%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 input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%9==0)
				System.out.println("Yes");
			else
				System.out.println("No");
 }

} Main public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%9==0)
				System.out.println("Yes");
			else
				System.out.println("No");
 } main {
		Scanner input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%9==0)
				System.out.println("Yes");
			else
				System.out.println("No");
 } Scanner input=new Scanner(System.in); input new Scanner(System.in) String s=input.next(); s input.next() input.next input long reminder reminder sum=0; sum 0 for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     } int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
				int x=s.charAt(i)-'0';
				sum+=x;
		     } {
				int x=s.charAt(i)-'0';
				sum+=x;
		     } int x=s.charAt(i)-'0'; x s.charAt(i)-'0' s.charAt(i) s.charAt s i '0' sum+=x sum x 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 System.out System System.out "Yes" 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 input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%9==0)
				System.out.println("Yes");
			else
				System.out.println("No");
 }

} public class Main {

	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%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 input=new Scanner(System.in);
	   String s=input.next();
	    long reminder,sum=0;
			
	    for(int i=0;i<s.length();i++)
			{
				int x=s.charAt(i)-'0';
				sum+=x;
		     }
			if(sum%9==0)
				System.out.println("Yes");
			else
				System.out.println("No");
 }

}