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

int main()
{
	int N, M;
	cin >> N >> M;
	vector<int> a(N + 1);
	int A;
	for(int i = 0; i < M; i++)
	{
		cin >> A;
		a[A] = 1;
	}
	
	vector<int> R(N + 1);
	int ans = 0;
	for(int i = 1; i <= N; i++)
	{
		if(a[i] != R[i])
		{
			for(int j = i; j <= N; j += i) R[j] = 1 - R[j];
		}
		else ans++;
	}
	cout << ans << endl;
	return 0;
}