#include <bits/stdc++.h>

using namespace std;
using ll = long long;

vector<ll> factor;

void all_factor(ll n){
    factor.clear();
    for (ll i = 1; i*i <= n; i++){
        if (n % i == 0){
            factor.push_back(i);
            if (i*i != n) factor.push_back(n / i);
        }
    }
    sort(factor.begin(), factor.end());
}

int main(){

    ll N, K, ans=0;
    cin >> N >> K;
    all_factor(N-K);

    for (auto x : factor){
        if (K+1 <= x && x <= N) ans++;
    }

    cout << ans << endl;

    return 0;
}