import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	}

	private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		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) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	}

	private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		if (sum % 9 == 0) 
			System.out.println("Yes");
		else 
			System.out.println("No");
	}

} Main public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	} main {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc solve(s, s.length()) solve s s.length() s.length s String[] args args private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		if (sum % 9 == 0) 
			System.out.println("Yes");
		else 
			System.out.println("No");
	} solve {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		if (sum % 9 == 0) 
			System.out.println("Yes");
		else 
			System.out.println("No");
	} long sum = 0; sum 0 for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		} int i = 0; int i = 0; i 0 i < len i len i++ i++ i {
			sum += s.charAt(i) - '0';
		} {
			sum += s.charAt(i) - '0';
		} sum += s.charAt(i) - '0' sum s.charAt(i) - '0' s.charAt(i) s.charAt s i '0' 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 System.out System System.out "Yes" System.out.println("No") System.out.println System.out System System.out "No" String s s int len len public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	}

	private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		if (sum % 9 == 0) 
			System.out.println("Yes");
		else 
			System.out.println("No");
	}

} public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	}

	private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		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) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		solve(s, s.length());
	}

	private static void solve(String s, int len) {
		// TODO Auto-generated method stub
		long sum = 0;
		for(int i = 0; i < len; i++) {
			sum += s.charAt(i) - '0';
		}
		if (sum % 9 == 0) 
			System.out.println("Yes");
		else 
			System.out.println("No");
	}

}
