import java.util.*;
import java.lang.*;

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

public class Main
{
	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
		String n=sc.next();
		int a[]=new int [n.length()+1];
		int ans=0;
		for(int i=0;i<n.length();i++)
		{
			a[i]=n.charAt(i)-'0';
		}
		for(int i=0;i<n.length();i++)
		{
			ans=ans+a[i];
		}
		if(ans%9==0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
}