#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

#include <atcoder/modint>
using namespace atcoder;
using mint = modint998244353;

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    int N;
    ll K;
    cin >> N >> K;
    vector<ll> A(N);
    rep(i, 0, N) cin >> A[i];
    
    mint prod = 1;
    mint v1 = 1, v2 = 1;
    rep(i, 0, N) {
        prod *= A[i];
        v1 *= min(A[i], K);
        v2 *= min(A[i], K - 1);
    }
    
    mint ans = (v1 - v2) / prod;
    cout << ans.val() << '\n';
}