import java.util.*;

 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 9 == 0)
		System.out.println("Yes");
		else
		System.out.println("No");

	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 9 == 0)
		System.out.println("Yes");
		else
		System.out.println("No");

	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 9 == 0)
		System.out.println("Yes");
		else
		System.out.println("No");

	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 9 == 0)
		System.out.println("Yes");
		else
		System.out.println("No");

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc char[] c = new char[s.length()]; c new char[s.length()] s.length() s.length s for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		} int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i ++ i ++ i {
			c[i] = s.charAt(i);
		} {
			c[i] = s.charAt(i);
		} c[i] = s.charAt(i) c[i] c i s.charAt(i) s.charAt s i int[] a = new int[s.length()]; a new int[s.length()] s.length() s.length s int sum = 0; sum 0 for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		} int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i ++ i ++ i {
			a[i] = Character.getNumericValue(c[i]);
		} {
			a[i] = Character.getNumericValue(c[i]);
		} a[i] = Character.getNumericValue(c[i]) a[i] a i Character.getNumericValue(c[i]) Character.getNumericValue Character c[i] c i for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		} int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i ++ i ++ i {
			sum += a[i];
		} {
			sum += a[i];
		} sum += a[i] sum a[i] a i 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) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 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);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 9 == 0)
		System.out.println("Yes");
		else
		System.out.println("No");

	}
} Main
import java.util.*;

 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();


		char[] c = new char[s.length()];

		for(int i = 0; i < s.length(); i ++){
			c[i] = s.charAt(i);
		}

		int[] a = new int[s.length()];
		int sum = 0;

		for(int i = 0; i < s.length(); i ++){
			a[i] = Character.getNumericValue(c[i]);
		}

		for(int i = 0; i < s.length(); i ++){
			sum += a[i];
		}
		if(sum % 9 == 0)
		System.out.println("Yes");
		else
		System.out.println("No");

	}
}