#include <bits/stdc++.h>
using namespace std;
const int INF = 1001001001;
const unsigned long long INFLL = 1001001001001001001LL;
template <typename T>
void pv(T a, T b) {
  for (T i = a; i != b; ++i) cout << *i << " ";
  cout << endl;
}
template <typename T>
void chmin(T& a, T b) {
  if (a > b) a = b;
}
template <typename T>
void chmax(T& a, T b) {
  if (a < b) a = b;
}
const unsigned long long MAX = 10000050;
int occ[MAX] = {}, isp[MAX];
int main() {
  int k;
  scanf("%d", &k);
  for (int i = 0; i < k; ++i) {
    int a;
    scanf("%d", &a);
    ++occ[a];
  }
  for (int i = 1; i < MAX; ++i) {
    occ[i] += occ[i - 1];
  }
  for (int i = 2; i < MAX; ++i) {
    isp[i] = 1;
  }
  unsigned long long n = 1;
  for (int i = 2; i < MAX; ++i) {
    if (isp[i]) {
      for (int j = i + i; j < MAX; j += i) {
        isp[j] = 0;
      }
      unsigned long long cnt = 0;
      for (unsigned long long p = i; p < MAX; p *= i) {
        for (unsigned long long q = p; q - 1 < MAX; q += p) {
          cnt += k - occ[q - 1];
        }
      }
      unsigned long long lo = 0, hi = 10000000000000LL;
      while (hi - lo > 1) {
        unsigned long long mid = (hi + lo) / 2;
        unsigned long long cc = 0;
        for (unsigned long long p = i; p <= mid; p *= i) {
          cc += mid / p;
        }
        if (cc >= cnt) {
          hi = mid;
        } else {
          lo = mid;
        }
      }
      chmax(n, hi);
    }
  }
  cout << n << endl;
  return 0;
}
