# L-12 MCS 260 Mon 8 Feb 2010 : Monte Carlo

import random 
print 'Monte Carlo simulation for Pi'
n = input('Give number of runs : ')
s = 0
for i in range(0,n):
   x = random.uniform(-1,1)
   y = random.uniform(-1,1)
   if x**2 + y**2 <= 1: s += 1
print 'After %d runs : %f' % (n,4.0*s/n)