def distance(L,D):
    res = 0
    v = L
    while L:
        res += L
        L //= 2
        if res == D:
            return True
    return False

def sdistance(L):
    res = 0
    v = L
    while L:
        res += L
        L //= 2
    return res

D = int(input())
l = 0
r = 10**18
while r - l > 1:
    m = (r + l)//2
    if sdistance(m) < D:
        l = m
    else:
        r = m
for i in range(l,l + 1000000):
    if distance(i,D):
        print(i)
        exit()