// Page 024

import java.util.Scanner;

class Prog_3_1     //CircleArea
{
	public static void main(String[] args)
	{
			// 1. Declaration part
			Scanner input = new Scanner(System.in);
			double radius, area;
			// 2. Input part
			radius = input.nextDouble();
			// 3. Computation part
			area = 3.14 * radius * radius;
			// 4. Output part
			System.out.println("The area is " + area);
	}
}