#include typedef unsigned long long ULLONG; typedef long long LLONG; static const LLONG MOD_NUM = 998244353LL; //1000000007LL; template static void get(_T& a) { std::cin >> a; } template static void get(_T& a, _T& b) { std::cin >> a >> b; } template static void get(_T& a, _T& b, _T& c) { std::cin >> a >> b >> c; } template static _T tp_abs(_T a) { if (a < (_T)0) { a *= (_T)-1; } return a; } template static _T tp_modpow(_T x, _T exp, _T mod = (_T)1) { _T ans = 1; _T base = x; while (exp > 0) { if (exp & (_T)1) { ans = (ans * base) % mod; } base = (base * base) % mod; exp >>= (_T)1; } return ans; } static void A_task(); int main() { A_task(); fflush(stdout); return 0; } static void A_task() { int N; get(N); LLONG K; get(K); LLONG sum = 0; std::vector ai(N); for (int i = 0; i < N; i++) { get(ai[i]); sum += ai[i]; } LLONG mul = tp_modpow(2LL, K, MOD_NUM); printf("%lld\n", (sum * mul) % MOD_NUM); }