import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 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 sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] cs = sc.next().toCharArray(); cs sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc int t = 0; t 0 for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		} int i = 0; int i = 0; i 0 i < cs.length i cs.length cs cs.length i++ i++ i {
			t += cs[i] - '0';
		} {
			t += cs[i] - '0';
		} t += cs[i] - '0' t cs[i] - '0' cs[i] cs i '0' if (t % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} t % 9 == 0 t % 9 t 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 sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 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 sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int t = 0;
		for (int i = 0; i < cs.length; i++) {
			t += cs[i] - '0';
		}
		if (t % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}
