// Calculating PI by iterative approximation
// Using Math.class (no import needed)

import java.io.*;

class iteration {

  public static void main (String[] args) throws IOException {

    BufferedReader stdin;
    stdin = new BufferedReader (new InputStreamReader (System.in));

    System.out.print ("Enter accuracy: ");
    double epsilon = (Double.valueOf (stdin.readLine())).doubleValue();

    int n = 4;
    double s, c, inner = 2.0, outer = 4.0;
    c = 1 / Math.sqrt(2);
    while (outer-inner > epsilon) {
       System.out.println (n + "\t" + inner + "\t" + outer);
       n = n * 2;
       s = Math.sqrt((1 - c) / 2);
       c = Math.sqrt((1 + c) / 2);
       inner = n * s * c;
       outer = n * s / c;
    }
  }
}