import java.util.Scanner;
class Main{
    double r,x,y;
    public void solve(){
        Scanner sc = new Scanner(System.in);
        r = sc.nextDouble();
        x = r * r * 3.141592653589;
        y = 2 * r * 3.141592653589;
        System.out.printf("%8.6f %8.6f",x,y);
    }
    public static void main(String[] args){
        new Main().solve();
    }
}
/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