［AtCoder］ABC-108｜A - Pair

設問ページ

• 🔗ABC-108 A - Pair

提出結果

def getInt():
    return int(input())


def main():
    k = getInt()

    x = k // 2
    y = k % 2

    print(x * (x + y))


if __name__ == "__main__":
    main()