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

using isize = size_t;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
using i128 = __int128_t;
using u128 = __uint128_t;
using f64 = long double;
using p2 = pair<i64, i64>;
using el = tuple<i64, i64, i64>;
using mint = atcoder::modint998244353;

void _main();
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
  _main();
}

i64 pow(i64 x, i64 n) {
  i64 res = 1;
  i64 t = x;
  while (n > 0) {
    if (n & 1) {
      res = res * t;
    }
    t = t * t;
    n >>= 1;
  }
  return res;
}
i64 pow(i64 x, i64 n, i64 m) {
  i64 res = 1;
  i64 t = x % m;
  while (n > 0) {
    if (n & 1) {
      res = res * t % m;
    }
    t = t * t % m;
    n >>= 1;
  }
  return res;
}

void _main() {
  i64 n;
  cin >> n;
  vector<i64> a(n);
  for (i64 i = 0; i < n; i++) {
    cin >> a[i];
  }
  i64 l = 0, r = n + 1;
  while (r - l > 1) {
    i64 mid = (l + r) / 2;
    atcoder::mf_graph<i64> g(mid + n + 2);
    for (i64 j = 0; j < n; j++) g.add_edge(mid + j, mid + n + 1, 1);
    for (i64 i = 1; i <= mid; i++) {
      g.add_edge(mid + n, i, 1);
      for (i64 j = 0; j < n; j++) {
        if (a[j] % i == 0) {
          g.add_edge(i - 1, mid + j, 1);
        }
      }
    }
    i64 f = g.flow(mid + n, mid + n + 1);
    if (f >= mid) l = mid;
    else r = mid;
  }
  cout << l << "\n";
}