import java.io.*;

class Main {
	public static void main(String[] args){
		double r, m, l;
		try{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			String buf = br.readLine();
			
			m = 0; 
			l = 0;
			r = Double.parseDouble(buf);
			m = Math.PI*r*r;
			l = 2*Math.PI*r;
			
		System.out.printf("%f %f\n", m, l);			
		}catch(Exception e){
		}
	}
}
/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