# 2つの変数がある、K回跳ねる、距離x
# 1つを固定する、K回を決めたときの距離xは何になるか、そのときにDに止まるか
# K<64でよい、それで10**18もゼロになる

D = int(input())

def distance(K, x):
    dist = 0
    for i in range(K):
        dist += x
        x //= 2
    return dist
    
#distance(3, 6)

def check_K(K):
    OK = 10**20
    NG = 0
    while OK-NG>1:
        mid = (OK+NG)//2
        if distance(K, mid) >= D:
            OK = mid
        else:
            NG = mid
    if distance(K, OK) == D:
        return 1, OK
    else: 
        return 0, 'nosolution'

ans = 10**20
for k in range(1, 65):
    #print(k, check_K(k))
    if check_K(k)[0] == 1:
        ans = min(ans, check_K(k)[1])
print(ans)