JAVA Help

import java.util.*;
class smith
{
    public static void main ()
    {
        Scanner s= new Scanner (System.in);
        System.out.println("Enter a no.");
        int n=s.nextInt();int d=n;
        int a=0,b=0,c,i,j,x,su=0,sum=0,k,y,z;
        for (i=1;i<=n;i++)
        {
            if (n%i==0)
            a++;
        }
        if (a!=2)
        {
            for (j=2;j<=n;j++)
            {
                if (n%j==0)
                {
                    y=j;
                    for (k=1;k<=j;k++)
                    {
                        if (j%k==0)
                        b++;
                    }
                    if (b==2)
                    {
                        z=j;
                        while (z>0)
                        {
                            c=z%10;
                            sum=sum+c;
                            z=z/10;
                        }
                    }
                    n=n/y;
                    j=1;
                }
            }
        }
        else
        {
            System.out.println ("no. is not composite");
        }
        while (d>0)
        {
            x=d%10;
            su=su+x;
            d=d/10;
        }
        if (su==sum)
        System.out.println ("no. is smith no.");
        else
        System.out.println ("no. is not smith");
    }
}