D = int(input())

INF = 10 ** 18 + 1


def f(i, x):
    res = 0
    for _ in range(i):
        res += x
        x //= 2
    return res


ans = D
for i in range(1, 62):
    l, r = 1, INF
    while r - l > 1:
        m = (r + l) // 2
        if f(i, m) <= D:
            l = m
        else:
            r = m
    if f(i, l) == D:
        ans = min(ans, l)
print(ans)