import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		if(n % 3 == 0){
			System.out.println("yes");
		}else{
			System.out.println("no");
		}
		sc.close();
	}

}
/**************************************************************
	Problem: 1633
	User: admin
	Language: Java
	Result: Accepted
	Time:701 ms
	Memory:39856 kb
****************************************************************/