#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;

int main(){
    ll n, k, cnt = 0;
    cin >> n >> k;
    for (ll i = k + 1; i <= pow((n-k), 0.5); i++){
        if (!((n-k)%i)) cnt += 2;
    }
    if (k) cnt--;
    cout << cnt << endl;
}