import java.util.Scanner;
import java.lang.Math.*;
import java.io.*;
import java.util.*;
public class JavaClass {
public static void main(String[] args) {
double area;
double r;
Scanner input = new Scanner(System.in);
System.out.print("Enter pls r (radius): ");
r = input.nextDouble();
area = Math.PI * r * r;
double length = Math.PI * 2 * r;
System.out.println("Area: " + area);
System.out.println("lenght of circle: " + length);
}
}