

import java.math.BigDecimal;
import java.util.*;

public class Main {
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		
		String str;//???????????\??????
		
		double r;
		r = scan.nextDouble();
		
		//double r;
		//r = Double.parseDouble(Integer.toString(scan.nextInt()) + ".0");//??°??????????????????/0????????????
		//?????¨?????3.14
		
		//????????¢???????±???????
		//BigDecimal x = new BigDecimal(?¨???????????????\??????);
		BigDecimal x = new BigDecimal(r * r * Math.PI);
		str = String.valueOf(x.setScale(5, BigDecimal.ROUND_UP)) + " ";
		
		
		
		//?????¨????????????????±???????
		BigDecimal y = new BigDecimal(2 * r * Math.PI);
		str = str + String.valueOf(y.setScale(5, BigDecimal.ROUND_HALF_UP));
		
		
		System.out.println(str);
		
		
	}
}
/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