#include <iostream>
using namespace std;

const long mod = 998244353;
const long sixinv = 166374059;

const int powpow2[] = {
    2,         4,         16,        256,       65536,     301989884, 932051910,
    299560064, 169907034, 60241440,  595200811, 819041188, 954185916, 830057642,
    679814667, 167578608, 683753077, 918327899, 24717300,  408611293, 722462153,
    849665201, 820873187, 255016623, 640755667, 678702777, 598597635, 917380677,
    346033774, 539618490, 395868439, 515592166, 378817861, 470355006, 289156217,
    955499538, 626269029, 122371506, 155543970, 301496519, 220050301, 658891113,
    480750826, 852127815, 737081821, 148579152, 820873187, 255016623, 640755667,
    678702777, 598597635, 917380677, 346033774, 539618490, 395868439, 515592166,
    378817861, 470355006, 289156217, 955499538, 626269029, 122371506, 155543970,
    301496519};

long pow2(long n) {
  long ret = 1;
  for (int i = 0; i < 64; i++) {
    if (n % 2 == 1) ret *= powpow2[i];
    n /= 2;
    ret %= mod;
  }
  return ret;
}

int main() {
  long n, k;
  cin >> n >> k;
  long suma = 0;
  int a;
  for (int i = 0; i < n; i++) {
    cin >> a;
    suma += a;
    suma %= mod;
  }
  long ret = pow2(k % (mod - 1));
  ret *= suma;
  ret %= mod;
  cout << ret << endl;
  return 0;
}