import java.util.Scanner;
public class PronicNumbers
{
    public static void main(String[] args)
    {
        int num=0, i=0;
        boolean flag=false;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a number");
        num=sc.nextInt();
        for(i=0;i<=num;i++)
        {
            if((i*(i+1))==num)
            {
                flag=true;
                break;
            }
        }
        if(flag==true)
        {
            System.out.print(num + " is a pronic number ");
        }
        else
        {
            System.out.print(num + " is not a pronic number ");
        }

    }
}