#include <bits/stdc++.h>

using namespace std;

int n, m;

int checker(const vector<int> &_a, int k) {
  int _n = n;
  for (auto i : _a) {
    while (i > k) {
      i -= k;
      _n -= k;
    }
    if (i > 0) {
      _n - k
    }
  }
}

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

  cin >> n >> m;
  vector<int> a(n);
  for (auto &i : a)
    cin >> i;

  int l = 0, r = n;
  while (l < r) {
    int mid = (l + r) / 2;

    if (checker(a, mid)) {
      r = mid;
    } else {
      l = mid + 1;
    }
  }
}