
import java.util.*;

public class Main {

	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
		String n=sc.next();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		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 sc=new Scanner(System.in);
		String n=sc.next();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		if(sum%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();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		if(sum%9==0) System.out.println("Yes");
		else System.out.println("No");
		
	} main {
		Scanner sc=new Scanner(System.in);
		String n=sc.next();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		if(sum%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 sum=0; sum 0 for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		} int i=0; int i=0; i 0 i<n.length() i n.length() n.length n i++ i++ i {
			sum+=(int)n.charAt(i)-48;
		} {
			sum+=(int)n.charAt(i)-48;
		} sum+=(int)n.charAt(i)-48 sum (int)n.charAt(i)-48 (int)n.charAt(i) n.charAt n i 48 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 sc=new Scanner(System.in);
		String n=sc.next();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		if(sum%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();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		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 sc=new Scanner(System.in);
		String n=sc.next();
	//System.out.println(n.length());
		int sum=0;
		for(int i=0;i<n.length();i++)
		{
			sum+=(int)n.charAt(i)-48;
		}
		
		if(sum%9==0) System.out.println("Yes");
		else System.out.println("No");
		
	}
}
