using System.Linq;
using System.Numerics;
using System;

public class Hello
{
    public static int MOD = 998244353;
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var k = long.Parse(line[1]);
        line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, long.Parse);
        var asum = a.Sum() % MOD;
        getAns(k, asum);
    }
    static void getAns(long k, long asum  )
    {
        var ans = BigInteger.ModPow(2, k, MOD);
        ans *= asum;
        ans %= MOD;
        Console.WriteLine(ans);
    }
}