#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
using ll = long long;

vector<ll> enum_divs (ll x) {
    vector<ll> res;
    for (int i = 1; i <= x; i++) {
        if (x < 1LL * i * i) break;
        if (x % i == 0) {
            res.push_back(i);
            if (x / i != i) res.push_back(x/i);
        }
    }
    sort(res.begin(), res.end());

    return res;
}

int main () {
    ll N, K; cin >> N >> K;

    auto divs = enum_divs(N-K);
    int ans = 0;
    for (auto& v : divs) if (K < v) ans++;

    cout << ans << "\n";
}