def factorization(n):
    arr = []
    temp = n
    for i in range(2, int(-(-n**0.5//1))+1):
        if temp%i==0:
            cnt=0
            while temp%i==0:
                cnt+=1
                temp //= i
            arr.append([i, cnt])

    if temp!=1:
        arr.append([temp, 1])

    if arr==[]:
        arr.append([n, 1])

    return arr
  
n,k = map(int, input().split())

a = factorization(n-k)
#print(a)

ans = 1
for i in a:
  if(i[0]!=1):
    ans*=i[1]+1
    
if(k==0):
  ans+=1
print(ans-1)