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

mod=998244353
p,q=1,1
for a in A:
  p*=min(a,K)*pow(a,-1,mod)
  q*=min(a,K-1)*pow(a,-1,mod)
  p%=mod;q%=mod 
print((p-q)%mod)