def func():
    n = int(input())

    nbin = bin(n)

    res = 0
    res2 = 0
    for i in nbin:
        if i == '1':
            res += 1
        else:
            res2 = max(res, res2)
            res = 0

    print(max(res, res2))


if __name__ == "__main__":
    func()