def main():
    N = int(input())
    R = input()

    if len(R) == 3:
        R100 = int(R[-1]) * 10
    elif len(R) == 4:
        R100 = int(R[-2:])
    else:
        raise ValueError

    print(((100**N - (100 - R100)**N) / 100**(N - 2)) / R100)


if __name__ == "__main__":
    main()