import java.io.*;

class CircleMain
{
  public static void main(String[] args) throws IOException
    {
      // Allow up to 5 circles to be created.
      int max = 5;
      String strRadius;
      double radius;
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
      System.out.println("Please input " + max + "radius values.");
      for(int i = 0; i < max; i++)
	{
	  strRadius = in.readLine();
	  radius = Double.parseDouble(strRadius);
          if(radius > 0)
	    {
	      Circle c = new Circle(radius);
	      System.out.println("Area = "+c.area());
	    }
	  else
	    System.out.println("The radius must be positive.");
	}
    }
}