function m()
    strs = readlines()
    N,K = parse.(Int128,split(strs[1]))
    A = parse.(Int128,split(strs[2]))

    prod1 = 1
    prod2 = 1
    cou1 = 1
    cou2 = 1
    for i in 1:N
        if A[i]>K
            prod1 = mod(prod1*K,998244353)
            cou1 = mod(cou1*A[i],998244353)
        end
        if A[i]>(K-1)
            prod2 = mod(prod2*(K-1),998244353)
            cou2 = mod(cou2*A[i],998244353)
        end
    end
    ansQ = prod1//cou1-prod2//cou2
    print(mod(ansQ.num*invmod(ansQ.den,BigInt(998244353)),998244353))
end;m()