import java.util.Scanner;
import java.io.PrintStream;

public class Area
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		PrintStream output = System.out;
		
		output.print("Provide radius: ");
		double radius = input.nextDouble();
		double area = Math.PI * Math.pow(radius, 2);
		output.printf("The area is %d%n", area);
	}
}