n,k = map(int,input().split())
ans = n-k
def divisor_list_s(num):
    divisors = []
    for i in range(1, int(num**0.5)+1):
        if num % i == 0:
            divisors.append(i)  
            if i**2 == num:
                continue
            divisors.append(int(num/i))
    return len(divisors)-1
  
print(divisor_list_s(ans))