import sys
from itertools import count


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n, k = map(int, input().split())
    MOD = 998244353
    a = sum(map(int, input().split()))

    return a * pow(2, k, MOD) % MOD


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)