#!/usr/bin/python
# -*- coding: utf8 -*-
# Soubor:  20111025-Tue-pi.py
# Datum:   25.10.2011 09:07
# Autor:   Marek Nožka, nozka <@t> spseol <d.t> cz
# Licence: GNU/GPL 

import math

S = 0.0
x = 0.0
dx = 1E-5

while x < 1:
    S = S + dx * math.sqrt(1- x*x)
    x = x + dx

print "%x" % (26)

print "cislo pi: %.20f" % (4*S)

print "cislo pi: {0:.8}".format(4*S)