from collections import deque
H,A = map(int,input().split())
ans = 0
Deq = deque()
Deq.append(H)
while Deq:
    h = Deq.popleft()
    h2 = h//2
    ans += 1
    if h2 >= 1:
        Deq.append(h2)
        Deq.append(h2)
print(ans)