#[allow(unused_imports)]
//use proconio::*;
use std::cmp::*;
use std::collections::*;
use std::io::*;
use std::iter::*;
use std::str::FromStr;

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}
const Mod:u64 = 998244353;
fn main() {
    let n:usize = read();
    let mut k:u64 = read();
    let mut a:Vec<u64> = (0..n).map(|_| read()).collect();
    let mut f:u64 = a.into_iter().sum();
    println!("{}",(rep_mul(2u64,k) * f) % Mod);
}
fn rep_mul(mut x: u64, mut n: u64) -> u64{
    let mut ans:u64 = 1;
    while n > 0{
       if n % 2 == 1 {
           ans = x * ans % Mod;
       }
           x = x * x % Mod;
           n = n >> 1u64;

    }
    ans
}