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[AtCoder]ABC-048|B - Between a and b ...
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提出結果
def getIntMap():
return map(int, input().split())
def main():
a, b, x = getIntMap()
print(((b // x) + 1) if a == 0 else ((b // x) - ((a - 1) // x)))
if __name__ == "__main__":
main()
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