# Program to calculate pi 
#
import random
random.seed(None)        # Seed generator, None => system clock

N_list =[10**i for i in range(1,7)]
for N in N_list:
    inside_count = 0
    for i in range(N):
        x,y = random.uniform(-1,1), random.uniform(-1,1) 
        if x**2 + y**2 < 1:
            inside_count += 1
    print "For N = %d, estimate of PI is: %5.4f " %(N, 4.0* inside_count/float(N))