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)

if(n-k <= k):
  print(0)
  exit()
  

def f(now, i):
 
  if(i==len(a)):
    if(now <= k):
      return 0
    #print(now)
    return 1
    
  count = 0
  aa = 1
  for j in range(a[i][1]+1):
    count += f(now*aa, i+1)
    aa*=a[i][0]
  return count
    
    
ans = f(1, 0)

print(ans)