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n = 2

finish = 51

stop = 33

commands = []

flag = False

def f():

global n, flag

if n == 18:

flag = True

if n > 18 and not flag:

return 0

if n == finish:

if '33' in ''.join(commands):

return 0

else:

return 1

elif n == stop:

return 0

elif n > finish:

return 0

n += 1

commands.append('1')

b = flag

s1 = f()

flag = b

commands.pop()

n -= 1

n += 3

commands.append('2')

b = flag

s2 = f()

flag = b

commands.pop()

n -= 3

n *= 2

commands.append('3')

b = flag

s3 = f()

flag = b

commands.pop()

n /= 2

return s1 + s2 + s3

print ("start") 

c = f()

print ("finish")

print (c)