#include <bits/stdc++.h>
using namespace std;

/* alias */
// type
using ull = unsigned long long;
using ll = long long;
using ld = long double;
// pair
using pii = pair<int, int>;
// vector
using vi = vector<int>;
using vl = vector<long>;
using vll = vector<ll>;
using vvi = vector<vi>;
using vvl = vector<vl>;
using vvll = vector<vll>;
using vs = vector<string>;
using vpii = vector<pii>;

/* define short */
#define mp make_pair
#define all(obj) (obj).begin(), (obj).end()
#define YesNo(bool) if(bool){cout<<"Yes"<<endl;}else{cout<<"No"<<endl;}

/* REP macro */
#define reps(i, a, n) for (ll i = (a); i < (ll)(n); ++i)
#define rep(i, n) reps(i, 0, n)
#define rrep(i, n) reps(i, 1, n + 1)
#define repd(i,n) for(ll i=n-1;i>=0;i--)
#define rrepd(i,n) for(ll i=n;i>=1;i--)

//定数
#define inf 2147483647;
#define INF 9223372036854775807;

/* func */
inline int in_int() {int x; cin >> x; return x;}
inline ll in_ll() {ll x; cin >> x; return x;}
inline double in_double() {{double x; cin >> x; return x;}}
inline string in_str() {string x; cin >> x; return x;}
inline int ctoi(char c) {return c - '0';}
template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }

template <typename T>
map<T, T> prime_factor(T n) {
    map<T, T> ret;
    for (T i = 2; i * i <= n; i++) {
        T tmp = 0;
        while (n % i == 0) {
            tmp++;
            n /= i;
        }
        ret[i] = tmp;
    }
    if (n != 1) ret[n] = 1;
    return ret;
}
/*  divisor_num(n)
    入力：整数 n
    出力：nの約数の個数
    計算量：O(√n)
*/
template <typename T>
T divisor_num(T N) {
    map<T, T> pf = prime_factor(N);
    T ret = 1;
    for (auto p : pf) {
        ret *= (p.second + 1);
    }
    return ret;
}

int main() {
  ll n, k;
  cin >> n >> k;

  n-=k;

  if (k != 0 ) {
      cout << divisor_num<ll>(n) -1 << endl;
  }else {
      cout << divisor_num<ll>(n) << endl;
  }
}