#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)

vector<ll> enum_divisors(ll N) {
	vector<ll> res;
	for (ll i = 1; i*i <= N; ++i) {
		if (N % i == 0) {
			res.push_back(i);
			if (N / i != i) res.push_back(N / i);
		}
	}
	sort(res.begin(), res.end());
	return res;
}

int main() {
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	
	ll N, K;
	cin >> N >> K;
	vector<ll> divs = enum_divisors(N - K);
	int ans = 0;
	for (ll d : divs) if (d > K) ++ans;
	cout << ans << '\n';
}