def solve(p, q):
    try:
        num = q * p / (1 - q) / (1 - p)
        denom = 1 + q * p / (1 - q) / (1 - p)
        res = num / denom
    except ZeroDivisionError:
        return 1
    else:
        return res


def main():
    p, q = (float(x) / 100.0 for x in input().split())
    print("{:.12f}".format(solve(p, q) * 100))


if __name__ == "__main__":
    main()