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CharacterDevelopment.py
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CharacterDevelopment.py
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"""
Solution to the problem Character Development in Kattis web page.
Link: https://open.kattis.com/problems/character
"""
import math
import sys
def get_source():
"""Set the source as a file readed from the console or
the user input."""
if len(sys.argv) > 1:
return open(sys.argv[1])
else:
return sys.stdin
def solution():
"""Solution to the problem."""
file = get_source()
characters = int(file.readline())
total = 0
char_fact = math.factorial(characters)
for g in range(2, characters+1):
value = char_fact/(math.factorial(characters - g) * math.factorial(g))
total += value
#print 'g -> %d value -> %d total -> %d' % (g, value, total)
print total
if __name__ == '__main__':
solution()
# m! / (m-n)!*n!
# 2! / (2-2)! * 2!
# 3! / (3-2)! * 2 + 3! / (3-3)! * 3!