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[AtCoder]ABC-136|B - Uneven Numbers
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提出結果
def getInt():
return int(input())
def main():
n = getInt()
i = n
c = 0
while i > 0:
if len(str(i)) % 2 == 1:
c += 1
i -= 1
print(c)
if __name__ == "__main__":
main()
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