20 lines
335 B
Python
20 lines
335 B
Python
def problem_p02969(input_data):
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import sys
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input = sys.stdin.readline
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import collections
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import math
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def I():
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return int(eval(input_data))
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def MI():
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return list(map(int, input_data.split()))
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def LI():
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return list(map(int, input_data.split()))
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r = I()
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return 3 * r * r
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