import java.util.*;
public class pi
{
 public static void main(String[] args)
 {
 double cevre , alan ;
 double r;
 double Pi = 3.14;
 
 Scanner klavye = new Scanner(System.in);
 
 System.out.println("Çevreyi gir...");
 
 cevre = klavye.nextDouble();
 
 
 
 r = cevre/ (2 * Pi);
 
 System.out.println("Yaricap(r) = " + r);
 
 alan = Pi * r *r;
 
 System.out.println("Alan = " + alan);
 
 }
 
}