#include <bits/stdc++.h>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define MAX 200003
#define MOD 998244353
#define INF 1000000000

ll modpow(ll a,ll x){
  ll ret=1;
  a%=MOD;
  while(x>0){
    if(x%2==1){
      ret=ret*a%MOD;
    }
    a=a*a%MOD;
    x>>=1;
  }
  return ret;
}

ll modinv(ll x){
  return modpow(x,MOD-2);
}

int main(){
  ll N;
  ll K;
  cin>>N>>K;
  vector<ll> A(N);
  ll sum=0;
  for(int i=0;i<N;i++){
    cin>>A[i];
    sum+=A[i];
  }
  sum%=MOD;
  sum*=modpow(2,K);
  sum%=MOD;
  cout<<sum<<endl;
}