n,k = map(int, input().split())
ans = 0
def divisors(num):
    divisors = [1]
    if  num == 1:
        return divisors
    for i in range(2, num//2+1):
        if num % i == 0:
            divisors.append(i)
    divisors.append(num)
    return divisors
ans = divisors(n-k)
if k != 0:
    print(len(ans)-1)
else:
    print(len(ans))