N = int(input())

pts = []
n = N
while n > 0:
    pts.append(n)
    n //= 2
pts_ordinary = sum(pts)

pts_by_skill = []
for i in range(len(pts)):
    p = sum(pts[:i]) + pts[i]*2
    pts_by_skill.append(p)
pts_best = max(pts_by_skill)

print(pts_best - pts_ordinary)