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def main():

"""

Challenge 10: Look-and-say number sequence

http://www.pythonchallenge.com/pc/return/bull.html

Seq: 1, 11, 21, 1211, 111221, 312211, ...

"""

array = ['1']

for i in xrange(0, 31):

current = array[i][0]

array.append("")

count = 0

for j in array[i]:

if j == current:

count += 1

else:

array[i+1] += str(count)+current

count = 1

current = j

array[i+1] += str(count)+current

print(len(array[30]))

if __name__ == '__main__':

main()