#!/usr/bin/python

import sys
from decimal import *


pi_aprox=Decimal("0")
sign=-1

improve=Decimal("0.000000266764189")
pi=Decimal("3.141592653589793")
n4=Decimal("4")

a = int(sys.argv[1])
for i in range (1,a,2):
  sign=sign*-1
  pi_aprox=pi_aprox+(sign*n4/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