JAVA Help

import java.util.*;
class niven
{
    public static void main()
    {
        Scanner s=new Scanner(System.in);
        int n,a,sum=0,k;
        System.out.println("enter a no.");
        n=s.nextInt();
        k=n;
        while(n>0)
        {
            a=n%10;
            sum=sum+a;;
            n=n/10;
        }
        if (k%sum==0)
        System.out.println("niven no.");
        else
        System.out.println("not niven no.");
    }
}