ans = 10 ** 18 + 1
D = int(input())

def check(d,k):
    dist = 0
    for i in range(k):
        dist += d
        d //= 2
    return dist <= D

def search(k,d):
    lb = 0
    ub = d + 1
    while ub - lb > 1:
        mid = (ub + lb) // 2
        if check(mid,k):
            lb = mid
        else:
            ub = mid
    return lb

for i in range(1,65):
    d = search(i,D)
    d1 = 0
    d2 = d
    for j in range(i):
        d1 += d2
        d2 //= 2
    if d1 == D:
        ans = min(ans,d)
print(ans)