import java.io.*;

public class Main{
    public static void main(String[]args) throws NumberFormatException, IOException {
     
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        String[]str= br.readLine().split(" ");
        double a = Double.parseDouble(str[0]);
        
        double circumference  = 2*a*Math.PI;
        double area = a*a*Math.PI;
        System.out.printf("%.6f %.6f",  area, circumference);
    }
}
/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