# https://yukicoder.me/problems/no/3153


MOD = 998244353

def main():
    N, K = map(int, input().split())
    A = list(map(int, input().split()))

    # 全ての面がK以下となる確率を計算
    answer = 1
    for a in A:
        if a > K:
            answer *= (K * pow(a, MOD - 2, MOD)) % MOD
            answer %= MOD

    answer2 = 1
    for a in A:
        if a > (K - 1):
            answer2 *= ((K - 1) * pow(a, MOD - 2, MOD)) % MOD
            answer2 %= MOD

    answer -= answer2
    answer %= MOD
    print(answer)



    





if __name__ == "__main__":
    main()