import java.io.*;
import java.util.*;


public class Main{
	
	public static void main(String[] args){
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	}
	
	
	
	public static PrintWriter out;
	
	public static class MyScanner{
		
		BufferedReader br;
		StringTokenizer st;
		
		public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		
		String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      }

   }
	
} import java.io.*; io.* java import java.util.*; util.* java public class Main{
	
	public static void main(String[] args){
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	}
	
	
	
	public static PrintWriter out;
	
	public static class MyScanner{
		
		BufferedReader br;
		StringTokenizer st;
		
		public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		
		String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      }

   }
	
} Main public static PrintWriter out; out public static void main(String[] args){
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	} main {
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	} MyScanner sc = new MyScanner(); sc new MyScanner() out = new PrintWriter(new BufferedOutputStream(System.out)) out new PrintWriter(new BufferedOutputStream(System.out)) String input = sc.next(); input sc.next() sc.next sc int counter = 0; counter 0 int temp = Integer.parseInt("5"); temp Integer.parseInt("5") Integer.parseInt Integer "5" for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	} int i = 0; int i = 0; i 0 i < input.length() i input.length() input.length input i++ i++ i {
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	} {
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	} counter += Integer.parseInt(Character.toString(input.charAt(i))) counter Integer.parseInt(Character.toString(input.charAt(i))) Integer.parseInt Integer Character.toString(input.charAt(i)) Character.toString Character input.charAt(i) input.charAt input i if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	} counter % 9 == 0 counter % 9 counter 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" out.close() out.close out String[] args args public static class MyScanner{
		
		BufferedReader br;
		StringTokenizer st;
		
		public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		
		String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      }

   } MyScanner BufferedReader br; br StringTokenizer st; st public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		} MyScanner {
			br = new BufferedReader(new InputStreamReader(System.in));
		} br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      } next {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      } while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          } try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              } catch (IOException e) {
                  e.printStackTrace();
              } IOException e {
                  e.printStackTrace();
              } e.printStackTrace() e.printStackTrace e {
                  st = new StringTokenizer(br.readLine());
              } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
          return Integer.parseInt(next());
      } nextInt {
          return Integer.parseInt(next());
      } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
          return Long.parseLong(next());
      } nextLong {
          return Long.parseLong(next());
      } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
          return Double.parseDouble(next());
      } nextDouble {
          return Double.parseDouble(next());
      } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      } nextLine {
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      } String str = ""; str "" try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  } catch (IOException e) {
	     e.printStackTrace();
	  } IOException e {
	     e.printStackTrace();
	  } e.printStackTrace() e.printStackTrace e {
	     str = br.readLine();
	  } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main{
	
	public static void main(String[] args){
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	}
	
	
	
	public static PrintWriter out;
	
	public static class MyScanner{
		
		BufferedReader br;
		StringTokenizer st;
		
		public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		
		String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      }

   }
	
} public class Main{
	
	public static void main(String[] args){
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	}
	
	
	
	public static PrintWriter out;
	
	public static class MyScanner{
		
		BufferedReader br;
		StringTokenizer st;
		
		public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		
		String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      }

   }
	
} Main
import java.io.*;
import java.util.*;


public class Main{
	
	public static void main(String[] args){
	
	MyScanner sc = new MyScanner();
	out = new PrintWriter(new BufferedOutputStream(System.out));
	
	/**/

	String input = sc.next();
	int counter = 0;
		
		int temp = Integer.parseInt("5");
		
	for(int i = 0; i < input.length(); i++){
		counter += Integer.parseInt(Character.toString(input.charAt(i)));
	}
	
	if(counter % 9 == 0){
		System.out.println("Yes");
	}else{
		System.out.println("No");
	}
	/**/
	 
	 out.close();	
	}
	
	
	
	public static PrintWriter out;
	
	public static class MyScanner{
		
		BufferedReader br;
		StringTokenizer st;
		
		public MyScanner(){
			br = new BufferedReader(new InputStreamReader(System.in));
		}
		
		String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
	  try {
	     str = br.readLine();
	  } catch (IOException e) {
	     e.printStackTrace();
	  }
	  return str;
      }

   }
	
}
