import java.util.Scanner;

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

		//??????????????????????????¢?????¨?????¨??????????????????
		Scanner sc = new Scanner(System.in);
		double dbR = sc.nextDouble();
		double dbMenseki = 0;
		double dbEnsyu = 0;

		//??¢?????¨?????¨????±???????
		dbMenseki = dbR * dbR * Math.PI;
		dbEnsyu = ( dbR * 2 ) * Math.PI;

		//6????????§??¨?????????
		String stMen = String.format("%.6f", dbMenseki);
		String stEnsyu = String.format("%.6f", dbEnsyu);

		System.out.println(stMen + " " + stEnsyu);
	}
}
/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