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

class union_find {
	vector<int> par;
public:
	union_find(int n) : par(n, -1) {}
	int find(int a) {
		return par[a] < 0 ? a : par[a] = find(par[a]);
	}
	bool same(int a, int b) {
		return find(a) == find(b);
	}
	void unite(int a, int b) {
		a = find(a);
		b = find(b);
		if (a == b) return;
		if (par[a] < par[b]) {
			par[a] += par[b];
			par[b] = a;
		}
		else {
			par[b] += par[a];
			par[a] = b;
		}
	}
	int size(int a) {
		return -par[find(a)];
	}
};

int main()
{
	int N, P;
	cin >> N >> P;
	union_find uf(N + 1);
	for (int i = 2; i <= N; i++) {
		for (int j = i; j <= N; j += i) {
			uf.unite(i, j);
		}
	}
	cout << uf.size(P) << endl;
	return 0;
}