#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;

using ll = long long;
const int INF = 1e9;
const ll inf = 1LL<<60;

void solve() {
  int n, m; cin >> n >> m;
  vector<int> a(n+1);
  for (int i=0; i<m; i++) {
    int A; cin >> A;
    a[A] = 1;
  }
  vector<int> d(n+1);
  for (int i=1; i<=n; i++) {
    for (int j=i; j<=n; j+=i) {
      d[i] ^= 1;
    }
  }
  vector<int> c(n+1);
  int ans = 0;
  for (int i=n; i>=1; i--) {
    for (int j=2*i; j<=n; j+=i) {
      d[i] ^= c[j];
    }
    if (d[i] != a[i]) {
      ans++;
      c[i] = 1;
    }
  }
  cout << ans << '\n';
}

int main() {
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  // int t; cin >> t;
  /*while (t--)*/ solve();
}