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 asum = 0L;
        for (int i = 0; i < n; i++)
        {
            asum += long.Parse(line[i]);
            asum %= 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);
    }
}