lib C;fun strtoll(s: UInt8*,p: UInt8**,b: Int32): Int64;end
class String;def to_i64;C.strtoll(self,nil,10);end;end

struct Int
  def pow(n : Int, mod = nil ) : Int
    a = to_i64
    res = 1_i64
    while n > 0
      if (n & 1) != 0
        res *= a
        res %= mod if mod
      end
      a *= a
      a %= mod if mod
      n >>= 1
    end
    res
  end
end

mod = 998244353

n, k = gets.to_s.split.map{ |e| e.to_i64 }
a    = gets.to_s.split.map{ |e| e.to_i64 }

p a.sum * 2i64.pow(k, mod) % mod