/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2022.05.20 22:18:18
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;


int main() {
    int n,m;cin >> n >> m;
    vector<int> b(n+1);
    for (int i = 0; i < m; i++) {
        int a;cin >> a;
        b[a] = 1;
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
        if (b[i] == 0) {
            ans++;
        }
        else {
            for (int j = i; j <= n; j+=i) {
                b[j] = 1-b[j];
            }
        }
    }
    cout << ans << endl;
    return 0;
}