Write a program to find out whether the given number is a perfect cube or not

For e.g.
Scenario 1: Input = 24 Output = 24 is not a perfect cube
Scenario 2: Input = 27 Output = 27 is a perfect cube of 3

import java.io.*;
import java.lang.*;

public class PerfectCube
{
	public static void main(String args[])throws IOException
	{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Enter a no : ");
		
		int i=Integer.parseInt(br.readLine());
		int j,k,c1=0;
		j=i/2;
		int c=0;
		for(k=2;k<=j;k++)
		{
			if(i%k==0)
			{
				//System.out.println(k);
				if((k*k*k)==i)
				{
					c1=1;		
				}
			}
		}
		if(c1==1)
		{
			System.out.println("Perfect CUBE");
		}
		else
		{
			System.out.println("Not a Perfect CUBE");
		}
	}
}