#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
long long sum = 0;
int main() {
	long long n, k;
	cin >> n >> k;
	for (int i = 0; i < n; i++) {
		long long a;
		cin >> a;
		sum += a;
		sum %= 998244353;
	}
	long long x = n * 2;
	long long y = k;
	long long ans = 1;
	while (y > 0) {
		if ((y & 1) == 1) {
			ans = ans * x % 998244353;
		}
		x = x * x % 998244353;
		y >>= 1;
	}
	x = n;
	y = k;
	long long ans1 = 1;
	while (y > 0) {
		if ((y & 1) == 1) {
			ans1 = ans1 * x % 998244353;
		}
		x = x * x % 998244353;
		y >>= 1;
	}
	x = ans1;
	y = 998244351;
	long long ans2 = 1;
	while (y > 0) {
		if ((y & 1) == 1) {
			ans2 = ans2 * x % 998244353;
		}
		x = x * x % 998244353;
		y >>= 1;
	}
	sum *= ans;
	sum %= 998244353;
	sum *= ans2;
	sum %= 998244353;
	cout << sum << endl;
}