import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;

class Main {
    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    private static final DecimalFormat df = new DecimalFormat("0.########");
    public static void main(String[] Args) throws IOException {
        double r = Double.parseDouble(br.readLine());
        System.out.println(df.format(Math.PI*r*r)+" "+df.format(2.0*Math.PI*r));
    }
}
/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