#include <cstdio>
#include <string>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <iterator>
#include <cassert>
#include <numeric>
#include <functional>
#include <time.h>
#pragma warning(disable:4996) 

//#define ATCODER
#ifdef ATCODER
#include <atcoder/all>
#endif

typedef long long ll;
typedef unsigned long long ull;
#define LINF  9223300000000000000
#define LINF2 1223300000000000000
#define LINF3 1000000000000
#define INF 2140000000
//const long long MOD = 1000000007;
const long long MOD = 998244353;


using namespace std;
#ifdef ATCODER
using namespace atcoder;
#endif


ll mpow(ll x, ll n) { //x^n(mod M)
    ll ans = 1;
    while (n != 0) {
        if (n & 1) ans = ans * x % MOD;
        x = x * x % MOD;
        n = n >> 1;
    }
    return ans;
}

ll minv(ll x) {
    return mpow(x, MOD - 2);
}

void solve()
{
    int n; ll K;
    scanf("%d%lld", &n, &K);
    int i;
    ll s = 0;
    for (i = 0; i < n; i++) {
        ll tmp;
        scanf("%lld", &tmp);
        s = (s + tmp) % MOD;
    }
    s = s * minv(n) % MOD;

    s = s * mpow(2, K) %MOD;

    s = s * n % MOD;
    printf("%lld\n", s);

    return;
}

int main()
{
#if 1
    solve();
#else
    int T;
    scanf("%d", &T);
    int t;
    for (t = 0; t < T; t++) {
        //printf("Case #%d: ", t + 1);
        solve();
    }
#endif
    return 0;
}