D = int(input())
K = 64
ans = D
for k in range(1,K+1):
    high = D
    low = 1
    while abs(high - low) > 1:
        mid = (high-low)
        dist = 0
        x = mid
        for n in range(k):
            dist += x
            x //= 2
        if dist >= D:
            high = mid
        else:
            low = mid
    v = 0
    x = high
    for i in range(k):
        v += x
        x //= 2
    if (v == D):
        ans = high
print(ans)