def distance(L, count):
    res = 0
    v = L
    for i in range(count):
        res += v
        v //= 2
    return res


ans = 10**40

D = int(input())

for bound in range(1, 100):
    l, r = 0, 10**20
    while r - l > 1:
        m = (r + l)//2
        if distance(m, bound) < D:
            l = m
        else:
            r = m
    if distance(r, bound) == D:
        ans = min(ans, r)
print(ans)