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 str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		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 str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		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 str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		if(sum%9==0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
      
	} main {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		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 str = br.readLine(); str br.readLine() br.readLine br int MAX = str.length(); MAX str.length() str.length str int sum = 0; sum 0 for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		} int i = 0; int i = 0; i 0 i < MAX i MAX i++ i++ i {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		} {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		} int s = Integer.parseInt(str.substring(i,i+1)); s Integer.parseInt(str.substring(i,i+1)) Integer.parseInt Integer str.substring(i,i+1) str.substring str i i+1 i 1 sum = sum + s sum sum + s sum s 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("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 IOException{

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		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 str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		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 str = br.readLine();

		int MAX = str.length();
		int sum = 0;
		for(int i = 0; i < MAX; i++) {
			int s = Integer.parseInt(str.substring(i,i+1));
			sum = sum + s;
		}

		if(sum%9==0) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
      
	}
}
