D = int(input())

# むむむ、二分探索と思ったらDにぴったり止まる必要ある
# つまり行き過ぎてはダメなので二分探索ではダメか
# その数が辿り着く数列を考える必要あるか

def max_distance(num):
    dist = 0
    test = False
    while num >= 1:
        dist += num
        num //= 2
        if dist == D:
            test = True
    return dist, test

#for i in range(1, 30):
#    print(i, max_distance(i))

OK = D+1
NG = 0
while OK-NG>1:
    mid = (OK+NG)//2
    if max_distance(mid)[0] >= D:
        OK = mid
    else:
        NG = mid
#print(OK)

candidate = OK
while True:
    if max_distance(candidate)[1] == True:
        print(candidate)
        break
    else:
        candidate += 1