/* 💕💕💕💕💕
💗💗💗💗💗
  /)/)
( . .)
( づ💗

    💗💗💗  💗💗💗
  💗💗💗💗💗💗💗💗💗
  💗💗💗💗💗💗💗💗💗
    💗💗💗💗💗💗💗
      💗💗💗💗💗
        💗💗💗
          💗

*/
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <complex>
#include <cstdint>
#include <cstring>
#include <ctime>
#include <deque>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <vector>

void solve() {
  long long n, k;
  std::cin >> n >> k;
  std::vector<long long> a(n);
  for (auto& i : a) std::cin >> i;
  auto get_divisors = [](long long n) {
    std::vector<long long> res;
    for (long long i = 1; i * i <= n; i++) {
      if (n % i == 0) {
        res.push_back(i);
        if (i * i != n) res.push_back(n / i);
      }
    }
    return res;
  };
  std::set<long long, std::greater<long long>> c;
  for (int i = 0; i < n; i++) {
    auto p = get_divisors(a[i]);
    for (auto j : p) {
      c.insert(j);
    }
  }

  for (auto g : c) {
    long long cnt = 0;
    for (auto x : a) {
      long long distance = std::abs(g * (x / g + 1) - x);
      if (x > g) distance = std::min(distance, x % g);
      if (x == distance) distance = 0;
      cnt += distance;
      // if (g == 998244353) std::cout << distance << '\n';
    }

    if (cnt <= k) {
      std::cout << g << '\n';
      return;
    }
  }
  std::cout << 1 << '\n';
}
int main() {
  int t = 1;
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  // std::cin >> t;
  while (t--) solve();

  return 0;
}