def divisor_count(x):
  div_cnt = 0
  for i in range(1, int(x**0.5) + 1):
    if x%i == 0:
      x //= i
      div_cnt += 1
      if x//i != i:
        div_cnt += 1
  return div_cnt

N, K = map(int, input().split())
ans = divisor_count(N-K)
print(ans if K == 0 else ans-1)