#include<bits/stdc++.h>
//#include<atcoder/all>
using namespace std;
using ll = long long;
const ll MOD = 998244353;

ll modpow(ll x,ll y){
	ll res = 1;
	while(y){
		if(y%2)(res*=x)%=MOD;
		(x*=x)%=MOD;
		y/=2;
	}
	return res;
}

int main()
{
	ll n,k;
	cin >> n >> k;
	vector<ll> a(n);
	for(ll i=0;i<n;i++){
		cin >> a[i];
	}
	ll sum = 0;
	for(auto &i:a)(sum += i)%=MOD;
	(sum*=modpow(2,k))%=MOD;
	cout<<sum<<endl;

}