#! /usr/bin/env python

# Print digits of pi forever.

#

# The algorithm, using Python's 'long' integers ("bignums"), works

# with continued fractions, and was conceived by Lambert Meertens.

#

# See also the ABC Programmer's Handbook, by Geurts, Meertens & Pemberton,

# published by Prentice-Hall (UK) Ltd., 1990.

import sys

def main():

    k, a, b, a1, b1 = 2L, 4L, 1L, 12L, 4L

    while 1:

        # Next approximation

        p, q, k = k*k, 2L*k+1L, k+1L

        a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1

        # Print common digits

        d, d1 = a//b, a1//b1

        while d == d1:

            output(d)

            a, a1 = 10L*(a%b), 10L*(a1%b1)

            d, d1 = a//b, a1//b1

def output(d):

    # Use write() to avoid spaces between the digits

    # Use str() to avoid the 'L'

    sys.stdout.write(str(d))

    # Flush so the output is seen immediately

    sys.stdout.flush()

if __name__ == "__main__":

    main()