import java.util.*;             // Date class

public class CircleWithMain extends Object
{
  public static double area(double r)
  {
	double i;
	if (r>0)
    { i = (Math.PI*Math.pow(r,2));}
	else
	{	i = 0;
			System.out.println("Bad Input");}
	return i;
  }
  public static double circumference(double r)
  {
	double i;
    if (r>0){
    	i =(Math.PI*r*2);}
	else{
		i = 0;
		System.out.println("Bad Input");}
  return i;
  }
  public static void main(String[] args)
  {
	  System.out.println(area(1.5));
	  System.out.println(circumference(1.5));
  }
	   
}