import java.math.BigDecimal;
import java.util.Scanner;

class Main{
    public static void main(String args[]){

        Scanner sc = new Scanner(System.in);
        double  r  = sc.nextDouble();
        sc.close();
        
        double pi = Math.PI;
        double ci = 2*pi*r;
        double ar = pi*Math.pow(r,2);

        String circ = BigDecimal.valueOf(ci).toPlainString();
        String area = BigDecimal.valueOf(ar).toPlainString();
        
        System.out.println(new StringBuilder()
            .append(area).append(" ")
            .append(circ));
    }
}
/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