h,a = map(int,input().split())
sr = [h]
ans = 0

while True:
  if len(sr)==0:
    print(ans)
    exit()
  else:
    h_now = sr.pop(0)
    if h_now//a!=0:
      sr.append(h_now//a)
      sr.append(h_now//a)
    ans += 1