num,k = map(int, input().split())
def make_divisors(n):
    lower_divisors , upper_divisors = [], []
    i = 1
    while i*i <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n//i)
        i += 1
    return lower_divisors + upper_divisors[::-1]
ans = make_divisors(num-k)
pos = 0
for i in range(len(ans)):
    if ans[i] > k:
        pos = i
        break
print(len(ans)-pos)