def check(m):
    now = m
    x = 0
    while now:
        x += now
        now //= 2
    return x

D = int(input())
yes = 10 ** 18
no = 0
while yes - no != 1:
    mid = (yes + no)//2
    if check(mid) >= D:
        yes = mid
    else:
        no = mid

for i in range(yes, yes + 10 ** 6):
    now = i
    x = 0
    while now:
        x += now
        now //= 2
        if x == D:
            print(i)
            exit()