import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int N = 0;

        for (int i = 0; i < s.length(); i++) {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        }
        
        if (N % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
} import java.util.*; util.* java class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int N = 0;

        for (int i = 0; i < s.length(); i++) {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        }
        
        if (N % 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 s = sc.next();
        int N = 0;

        for (int i = 0; i < s.length(); i++) {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        }
        
        if (N % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int N = 0;

        for (int i = 0; i < s.length(); i++) {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        }
        
        if (N % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int N = 0; N 0 for (int i = 0; i < s.length(); i++) {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        } int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i++ i++ i {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        } {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        } N += Integer.parseInt(s.substring(i, i + 1)) N Integer.parseInt(s.substring(i, i + 1)) Integer.parseInt Integer s.substring(i, i + 1) s.substring s i i + 1 i 1 if (N % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No"); N % 9 == 0 N % 9 N 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
import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int N = 0;

        for (int i = 0; i < s.length(); i++) {    //1文字ずつ足していく
            N += Integer.parseInt(s.substring(i, i + 1));
        }
        
        if (N % 9 == 0)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}
