MOD = 998244353

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

x, y = 1, 1
for a in A:
	x *= min(K, a) * pow(a, MOD-2, MOD)
	x %= MOD
	y *= min(K-1, a) * pow(a, MOD-2, MOD)
	y %= MOD
print((x - y) % MOD)