MOD = 998244353
def inv(x):
  return pow(x,MOD-2,MOD)

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

def calc(k):
  ans = 1
  for a in A:
    ans *= min(k, a) * inv(a)
    ans %= MOD
  return ans

print((calc(K) - calc(K-1))%MOD)