test2.py

import random
import sys

def run(n=100):
	a = 0
	c = 0
	while a < n:
		c += 1
		if a % 2 == 0:
			d = 1
		else:
			d = -1
		if random.random() > 1/n:
			a += d
		else:
			a -= d
		if a < 0:
			a = 0
	print('n: {} c: {}'.format(n, c))
	return c

def main():
	run(int(sys.argv[1]))

main()