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

int a[100000];
int n, m;

int checker(int k) {
  int ret = 0;
  for (int i = 0; i < n; i++) {
    ret += k / a[i];
  }
  return ret;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  freopen("p145sumg.inp", "r", stdin);

  cin >> n >> m;
  int l = 1, r;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    r = max(r, a[i]);
  }
  r *= m;

  int res = r;
  while (l < r) {
    int mid = (l + r) / 2;
    if (checker(mid) >= m) {
      r = mid;
      res = min(mid, res);
    } else {
      l = mid + 1;
    }
  }
  cout << res << "\n";
}