import datetime
start = datetime.datetime.now()

new = []
biggest = []

n = 2
while n != 1:
    new.append(n)
    if n % 2 == 0:
        n = n / 2
    else:
        n = 3 * n + 1
    new.append(n)
    if n in array and len(array) + len

print datetime.datetime.now() - start
