import java.util.*;
import java.lang.*;
import java.math.*;
public class Main{
	public static void main(String[] args){
		Scanner stdIn=new Scanner(System.in);
		double r=stdIn.nextDouble();
		double s=r*r*Math.PI;
		double l=2*r*Math.PI;
		System.out.println(BigDecimal.valueOf(s).toPlainString()+" "+BigDecimal.valueOf(l).toPlainString());
	}
}
/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