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[AtCoder]ABC-134|A - Dodecagon
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提出結果
def getInt():
return int(input())
def main():
r = getInt()
print(3 * (r ** 2))
if __name__ == "__main__":
main()
def getInt():
return int(input())
def main():
r = getInt()
print(3 * (r ** 2))
if __name__ == "__main__":
main()
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