import java.util.*;

public class Main {
    static final int MOD = 998244353;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long k = sc.nextLong();
        long total = 0;
        for (int i = 0; i < n; i++) {
            total += sc.nextInt();
        }
        total %= MOD;
        System.out.println(total * pow(2, k) % MOD);
    }
    
    static long pow(long x, long p) {
        if (p == 0) {
            return 1;
        } else if (p % 2 == 0) {
            return pow(x * x % MOD, p / 2);
        } else {
            return pow(x, p - 1) * x % MOD;
        }
    }
}