MOD = 998244353

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

P = 1
for i in range(N):
    P *= min(K, A[i]) * pow(A[i], -1, MOD) % MOD
    P %= MOD

Q = 1
for i in range(N):
    Q *= min(K - 1, A[i]) * pow(A[i], -1, MOD) % MOD
    Q %= MOD

print((P - Q) % MOD)