#include<bits/stdc++.h>

int main(){
    using namespace std;
    const auto scan{[]{unsigned long N; cin >> N; return N;}};
    const auto N{scan()}, K{scan()}, S{[&scan, &N]{unsigned long ret{0}; for(unsigned long i{0}; i < N; ++i)ret += scan(); return ret;}()};
    constexpr unsigned long MOD{998244353};
    cout << [](unsigned long a, unsigned long n, unsigned long b){
        unsigned long r{b % MOD};
        while(n){
            if(n & 1UL)(r *= a) %= MOD;
            (a *= a) %= MOD;
            n >>= 1UL;
        }
        return r;
    }(2, K, S) << endl;
    return 0;
}