D = int(input())


def f(x):
    result = 0
    while x != 0 and result < D:
        result += x
        x //= 2
    return result


for i in range(60, 0, -1):
    t = D * (2 ** (i - 1)) // (2 ** i - 1)
    if f(t) == D:
        for j in range(-2, 1):
            if f(t + j) == D:
                print(t)
                exit()