import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		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 NumberFormatException, IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		if (sum%9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
} Main public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		if (sum%9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	} main {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		if (sum%9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	} BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); in new BufferedReader(new InputStreamReader(System.in)) String[] n = in.readLine().split(""); n in.readLine().split("") in.readLine().split in.readLine() in.readLine in "" int sum = 0; sum 0 for (String c : n) {
			sum += Integer.parseInt(c);
		} String c n {
			sum += Integer.parseInt(c);
		} {
			sum += Integer.parseInt(c);
		} sum += Integer.parseInt(c) sum Integer.parseInt(c) Integer.parseInt Integer c 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[] args args public class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		if (sum%9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
} public class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		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 NumberFormatException, IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String[] n = in.readLine().split("");
		int sum = 0;
		for (String c : n) {
			sum += Integer.parseInt(c);
		}
		if (sum%9 == 0)
			System.out.println("Yes");
		else
			System.out.println("No");
	}
}
