import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%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) throws Exception {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%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 String[] num = N.split(""); num N.split("") N.split N "" long count = 0; count 0 for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        } int i=0; int i=0; i 0 i<num.length i num.length num num.length i++ i++ i {
            count+= Long.parseLong(num[i]);
        } {
            count+= Long.parseLong(num[i]);
        } count+= Long.parseLong(num[i]) count Long.parseLong(num[i]) Long.parseLong Long num[i] num i if(count%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        } count%9==0 count%9 count 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) throws Exception {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String N=sc.next();
        String[] num = N.split("");
        long count = 0;
        
        for(int i=0;i<num.length;i++){
            count+= Long.parseLong(num[i]);
        }
        
        
        if(count%9==0){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
}
