N = int(input())
ans = 0
t = N
while t > 0:
    ans += t
    t //= 2

best = 0
for at in range(65):
    t = N
    curr = 0
    for i in range(65):
        if t == 0:
            break
        if i == at:
            curr += t * 2
            break
        else:
            curr += t
        t //= 2
    best = max(best, curr)

print(best - ans)