MOD = 998244353
class ModInt:
  def __init__(self, x):
    self.x = x % MOD

  def __str__(self):
    return str(self.x)

  __repr__ = __str__

  def __add__(self, other):
    return (
      ModInt(self.x + other.x) if isinstance(other, ModInt) else
      ModInt(self.x + other)
    )

  def __sub__(self, other):
    return (
      ModInt(self.x - other.x) if isinstance(other, ModInt) else
      ModInt(self.x - other)
    )

  def __mul__(self, other):
    return (
      ModInt(self.x * other.x) if isinstance(other, ModInt) else
      ModInt(self.x * other)
    )

  def __truediv__(self, other):
    return (
      ModInt(
        self.x * pow(other.x, MOD - 2, MOD)
      ) if isinstance(other, ModInt) else
      ModInt(self.x * pow(other, MOD - 2, MOD))
    )

  __floordiv__ = __truediv__

  def __pow__(self, other):
    return (
      ModInt(pow(self.x, other.x, MOD)) if isinstance(other, ModInt) else
      ModInt(pow(self.x, other, MOD))
    )

  __radd__ = __add__

  def __rsub__(self, other):
    return (
      ModInt(other.x - self.x) if isinstance(other, ModInt) else
      ModInt(other - self.x)
    )

  __rmul__ = __mul__

  def __rtruediv__(self, other):
    return (
      ModInt(
        other.x * pow(self.x, MOD - 2, MOD)
      ) if isinstance(other, ModInt) else
      ModInt(other * pow(self.x, MOD - 2, MOD))
    )

  def __rpow__(self, other):
    return (
      ModInt(pow(other.x, self.x, MOD)) if isinstance(other, ModInt) else
      ModInt(pow(other, self.x, MOD))
    )

N, K = map(int, input().split())
A = list(map(int, input().split()))
S = ModInt(sum(A))
print(S*pow(ModInt(2),K))