fun main() {
    val builder = StringBuilder()

    // 数学嫌いが悪化している気がする
    val mod = 998244353L

    val (n, k) = readInputLine().split(" ").map { it.toLong() }
    val aArr = readInputLine().split(" ").map { it.toLong() }.toLongArray()

    builder.appendln(aArr.sum() % mod * pow(2L, k, mod) % mod)

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}

fun pow(x: Long, n: Long, mod: Long): Long {
    var ret = 1L
    var base = x
    var nTmp = n

    while (nTmp != 0L) {
        if (nTmp % 2L != 0L) {
            ret = ret * base % mod
        }
        base = base * base % mod
        nTmp /= 2L
    }

    return ret
}