D = int(input())

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

ans = D
for n in range(100, 0, -1):
    l = 1
    r = D
    while r-l > 1:
        m = (l+r)//2
        if f(m, n) < D:
            l = m
        else:
            r = m
    if f(l, n) == D:
        ans = l
        break
    if f(r, n) == D:
        ans = r
        break
print(ans)