import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
} Main public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	} main {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	} Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in))); in new Scanner(new BufferedReader(new InputStreamReader(System.in))) String s = in.next(); s in.next() in.next in int ans = 0; ans 0 for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0'; int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i++ i++ i ans += s.charAt(i) - (char) '0'; ans += s.charAt(i) - (char) '0' ans s.charAt(i) - (char) '0' s.charAt(i) s.charAt s i (char) '0' if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No"); ans % 9 == 0 ans % 9 ans 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 public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
} public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
} Main
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		String s = in.next();
		int ans = 0;
		for (int i = 0; i < s.length(); i++)
			ans += s.charAt(i) - (char) '0';
		if (ans % 9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
}
