n, k = map(int, input().split())
a = list(map(int, input().split()))
MOD = 998244353

p = 1
q = 1

for i in range(n):
    # p: all lower or equal to K
    # q: all lower of equal to K - 1
    v = a[i]
    inv = pow(v, -1, MOD)
    p *= (min(v, k) * inv) % MOD
    p %= MOD
    q *= (min(v, k - 1) * inv) % MOD
    q %= MOD

print((p - q) % MOD)