［AtCoder］ABC-134｜B - Golden Apple

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• 🔗ABC-134 B - Golden Apple

提出結果

def getIntMap():
    return map(int, input().split())


def main():
    n, d = getIntMap()

    c = 2 * d + 1

    print(n // c + (0 if n % c == 0 else 1))


if __name__ == "__main__":
    main()