import java.util.Scanner;
import java.math.*;


/**
 * @author kawakami
 *
 */
/**
 * @author kawakami
 *
 */
public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner as = new Scanner(System.in);
		
	       
		double r,t,s;

	       
        
        r = as.nextDouble();
           
           
        s=3.141592653589*r*r;
        t=2.0*3.141592653589*r;
        
        BigDecimal ros = new BigDecimal(s);
        BigDecimal rot = new BigDecimal(t);
        
        ros=ros.setScale(6,BigDecimal.ROUND_HALF_UP);
        rot=rot.setScale(6,BigDecimal.ROUND_HALF_UP);

        System.out.println(ros+" "+rot);           


	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz