def distance(L):
    res = 0
    v = L
    while L:
        res += L
        L //= 2
    return res


D = int(input())
l = 0
r = 10**18
while r - l > 1:
    m = (r + l)//2
    if distance(m) < D:
        l = m
    else:
        r = m
print(r)