import java.util.Scanner;

public class Main {
	public static void main(String [] args) {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String [] args) {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
} Main public static void main(String [] args) {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    } main {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    } Scanner sn = new Scanner(System.in); sn new Scanner(System.in) String n = sn.next(); n sn.next() sn.next sn int digits = 0; digits 0 int sum = 0; sum 0 for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        } int i = 0; int i = 0; i 0 i < n.length() i n.length() n.length n i++ i++ i {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        } {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        } digits = Integer.parseInt(n.substring(i, i+1)) digits Integer.parseInt(n.substring(i, i+1)) Integer.parseInt Integer n.substring(i, i+1) n.substring n i i+1 i 1 sum = sum + digits sum sum + digits sum digits 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) {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
} public class Main {
	public static void main(String [] args) {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
} Main
import java.util.Scanner;

public class Main {
	public static void main(String [] args) {
    	Scanner sn = new Scanner(System.in);
      	String n = sn.next();
      	int digits = 0;
      	int sum = 0;
      	for(int i = 0; i < n.length() ; i++) {
        	digits = Integer.parseInt(n.substring(i, i+1));
          	sum = sum + digits; 
        }
      	if(sum % 9 == 0) {
        	System.out.println("Yes");
        } else {
        	System.out.println("No");
        }
    }
}