算法训练 完数

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 a=sc.nextInt();
        int k=1,data=0;
        while(a>k){
            if(a%k==0)
                data+=k;
            k++;
        }
        if(data==a){
            System.out.println("yes");
        }
        else
            System.out.println("no");

    }

}