import java.util.*;
import java.io.*;

class Main{
    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        double r = Double.parseDouble(s);
        //System.out.println(r);
        String x = String.format("%.6f",(r * r * Math.PI));
        String y = String.format("%.6f",( 2 * Math.PI *r));
        System.out.println(x+" "+y);
    }
}
/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