D = int(input())

def judge(l,cnt):
    m = l
    dis = l
    for i in range(cnt):
        dis += m//2
        m //= 2
    return dis
res = D
for i in range(1,61):
    ok, ng = 10**18+1,0
    while ok-ng>1:
        mid = (ok+ng)//2
        dis = judge(mid,i)
        if dis>=D:
            ok = mid
        else:
            ng = mid
    if judge(ok,i)==D:
        res = min(res,ok)
print(res)