#!/usr/local/bin/python

import sys

pi_aprox=0
sign=-1

improve=0.000000266764189
pi=3.141592653589793

a = int(sys.argv[1])
for i in range (1,a,2):
  sign=sign*-1
  pi_aprox=pi_aprox+(sign*(4.0)/i)
  print str((i+1)/2)+" "+str(pi_aprox)+" "+str(abs(pi-pi_aprox))
  if (abs(pi-pi_aprox) < improve):
     print "found during n=("+str(i)+"+1)/2! -> "+ str(pi_aprox)
     break