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[AtCoder]ABC-163|A - Circle Pond
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提出結果
import math
def getInt():
return int(input())
def main():
r = getInt()
print(2 * math.pi * r)
if __name__ == "__main__":
main()
import math
def getInt():
return int(input())
def main():
r = getInt()
print(2 * math.pi * r)
if __name__ == "__main__":
main()
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