from math import log2, log


class DiffSolveTime:
    def __init__(self, p: int, q: int):
        self.__p = p
        self.__q = q

    def diff_solve_time(self, n: int | float) -> float:
        return n ** 2 - self.__p - self.__q * n * log2(n)

    def diff_solve_time_derived(self, n: int | float) -> float:
        return n * 2 - self.__q * log2(n) - self.__q / log(2)

    def diff2_solve_time_derived(self, n: int | float) -> float:
        return 2 - self.__q / (n * log(2))

    def get_inflection(self) -> float:
        return self.__q / (2*log(2))


def main():
    P, Q = map(int, input().split())

    solver = DiffSolveTime(P, Q)
    N = 1e2
    while solver.diff_solve_time(N) < 0:
        N *= 10

    while abs(solver.diff_solve_time(N)) > 1e-6:
        N -= (solver.diff_solve_time(N)/solver.diff_solve_time_derived(N))
    print(N)


if __name__ == "__main__":
    main()