#include <bits/stdc++.h>
#define rep(i, n) for(int i= 0; i < (n); i++)
using ll= long long int;
using namespace std;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
ll mod= 1e9 + 7;
ll mmod= 998244353;

ll RepeatSquaring(ll N, ll P, ll M){
    if(P==0) return 1;
    if(P%2==0){
        ll t = RepeatSquaring(N, P/2, M);
        return t*t % M;
    }
    return N * RepeatSquaring(N, P-1, M)%M;
}

int main(){
  int n;
  ll k;
  cin >>n >>k;
  ll a[n];
  ll sum=0;
  rep(i,n){cin >> a[i];sum+=a[i];}
  sum%=mmod;

  cout << (RepeatSquaring((ll)2,k,mmod)*sum)%mmod << endl; 

}