import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} Main public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    } main {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    } BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String n=br.readLine(); n br.readLine() br.readLine br int sum=0; sum 0 for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        } int i = 0; int i = 0; i 0 i < n.length() i n.length() n.length n i++ i++ i {
            sum+=Integer.parseInt(n.charAt(i)+"");
        } {
            sum+=Integer.parseInt(n.charAt(i)+"");
        } sum+=Integer.parseInt(n.charAt(i)+"") sum Integer.parseInt(n.charAt(i)+"") Integer.parseInt Integer n.charAt(i)+"" n.charAt(i) n.charAt n i "" 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) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String []args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String n=br.readLine();
        int sum=0;
        for (int i = 0; i < n.length(); i++) {
            sum+=Integer.parseInt(n.charAt(i)+"");
        }
        if(sum%9==0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}
