/*
Program: Circle .java
Date: Feb. 25, 2010
Programmer: Ms. Bell

*/

import java.io.*;

public class Circle
{

	public static void main(String[] args) throws IOException
	{

	 BufferedReader dataIn= new BufferedReader(new InputStreamReader(System.in));


		String strRadius;
		double radius;
		double crcmfrnce;


		System.out.println("Please enter the radius: ");
			strRadius = dataIn.readLine();

		radius = Double.parseDouble(strRadius);

		crcmfrnce = Math.round(( 2 * Math.PI * radius));

		System.out.println();
		System.out.println("The circle's circumference is: " + crcmfrnce);
		System.out.println();
		}
}