D = int(input())

l = 0
r = D
while r - l > 1:
    m = (r + l) // 2
    cnt = 0
    x = m
    while x:
        cnt += x
        x //= 2
    if cnt < D:
        l = m
    else:
        r = m

for i in range(10**6):
    x = r + i
    tmp = x
    dist = 0
    while True:
        dist += x
        if dist >= D:
            break
        x //= 2
    if D == dist:
        break

print(tmp)