H, A = [int(x) for x in input().split()]
slimes = {H: 1}
ans = 0
nxt = {}
while slimes:
  for s in slimes:
    at = s // A
    if at > 0:
      if at not in nxt: nxt[at] = 0
      nxt[at] += slimes[s] * 2
    ans += slimes[s]