#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;
int main() {
    ll n,m;
    cin >> n >> m;
    vector<ll> viNum(n+1,0);
    for(ll i = 0 ; i < m; i++){
        ll x;
        cin >> x;
        viNum[x] = 1;
    }
    
    vector<vector<ll>> vviDiv(n+1);
    for(ll i = 1; i <= n; i++){
        for(ll j = 1; i*j <= n; j++){
            vviDiv[i*j].push_back(i);
        }
    }
    
    ll nAns = 0;
    for(ll i = n; i >= 1; i--){
        if(viNum[i] == 0){
            nAns++;
        } else {
            for(ll j = 0; j < vviDiv[i].size(); j++){
                viNum[vviDiv[i][j]] = 1-viNum[vviDiv[i][j]];
            }
        }
    }
    
    cout << nAns << endl;
    return 0;
}