#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 998244353; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

long long power(long long x, long long n){
    long long ans = 1;
    for(;n;n >>= 1, x *= x, ans %= MOD, x %= MOD)
        if(n&1)ans*=x;
    return ans % MOD;
}

signed main(){
	cout<<fixed<<setprecision(10);
	
	int N, K;
    int ans = 0, S = 0;
    vector<int> A;
    
    cin>>N>>K;
	
    A.resize(N);
	
    for(int i = 0; i < N; i++){
        cin>>A[i];
        S += A[i];
        S %= MOD;
    }
    
    ans = S * power(2, K) % MOD;
    
    cout<<ans<<endl;
    
	return 0;
}