d = int(input())
def dist(x, i):
    res = x
    for _ in range(i):
        x //= 2
        res += x
    return res
ans = d
for i in range(100):
    l, r = 0, d
    while r - l > 1:
        c = (l + r) // 2
        if dist(c, i) >= d:
            r = c
        else:
            l = c
    if dist(r, i) == d:
        ans = min(ans, r)
print(ans)