import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		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) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		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 str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		if(sum % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		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 str = sc.nextLine(); str sc.nextLine() sc.nextLine sc String[] numArr = str.split(""); numArr str.split("") str.split str "" int sum = 0; sum 0 for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		} String s numArr {
			int n = Integer.parseInt(s);
			sum += n;
		} {
			int n = Integer.parseInt(s);
			sum += n;
		} int n = Integer.parseInt(s); n Integer.parseInt(s) Integer.parseInt Integer s sum += n sum n 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("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);
		String str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		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 str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		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) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String[] numArr = str.split("");

		int sum = 0;
		for(String s : numArr) {
			int n = Integer.parseInt(s);
			sum += n;
		}

		if(sum % 9 == 0) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}