package com.gmail.mykhalskiyv;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		System.out.println("Please enter a circle Radius: ");
		int r = sc.nextInt();
		double l = 2*Math.PI*r;
System.out.println("The length of circle with radius R ="+r+" is l = "+l);
	}

}