d = int(input())

ans = d

def calc(x,n):
    count = 0
    i = n
    while x and i:
        count += x
        x //= 2
        i -= 1
        if count >= d:
            break
    return count

for i in range(1,70):
    l = 0
    r = d+1
    while r > l + 1:
        m = (r+l)//2
        if calc(m,i) >= d:
            r = m
        else:
            l = m
    if calc(r,i) == d:
        ans = min(ans,r)
print(ans)