#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

using ll = long long;
using mint = modint998244353;

int main() {
  int N, K;
  cin >> N >> K;
  vector<int> A(N);
  for(int i = 0; i < N; i++) {
    cin >> A[i];
  }
  mint x = 1, y = 1;
  for(int i = 0; i < N; i++) {
    x *= min(K, A[i]) / mint(A[i]);
    y *= min(K - 1, A[i]) / mint(A[i]);
  }
  cout << (x - y).val() << endl;
}