#include <bits/stdc++.h>

constexpr int mod = 998244353;

int main() {
  int N;
  std::cin >> N;
  std::vector<int> B(N);
  B[0] = 1;
  for (int i = 1; i < N; i++) {
    std::cin >> B[i];
    B[i] *= B[i - 1];
    if (B[i] > 1000000)
      std::abort();
  }

  std::string M_;
  std::cin >> M_;
  if (M_.size() >= 8)
    std::abort();
  const int M = std::stoi(M_);

  std::vector<int> dp(M + 1, 0);
  dp[0] = 1;
  for (const int e : B) {
    for (int i = e; i <= M; i++) {
      dp[i] += dp[i - e];
      dp[i] %= mod;
    }
  }

  std::cout << dp[M] << "\n";

  return 0;
}