#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  deque<vector<mint>> q;
  rep(i, n) {
    int a;
    cin >> a;
    q.push_back({1, a});
  }
  while (q.size() >= 2) {
    auto f = move(q.front()); q.pop_front();
    auto g = move(q.front()); q.pop_front();
    q.emplace_back(convolution(f, g));
  }
  auto f = move(q.front()); q.pop_front();
  mint ans;
  for (int i = 1; i <= n; i++) ans += f[i] * mint(i).pow(n - i);
  cout << ans.val() << '\n';
}