#include<bits/stdc++.h>
using namespace std;
using LL=long long;
using ULL=unsigned long long;
#define rep(i,n) for(int i=0;i<(n);i++)

template<ULL M>
struct static_modint {
	ULL x;
	static_modint(ULL val = 0) : x(val) {}
	template<class intTy, enable_if_t<is_integral<intTy>::value&& is_unsigned<intTy>::value, void*> isUnsignedInt = nullptr>
	static static_modint mod_construct(intTy val) { return static_modint(val % M); }
	template<class intTy, enable_if_t<is_integral<intTy>::value&& is_signed<intTy>::value, void*> isSignedInt = nullptr>
	static static_modint mod_construct(intTy val) { LL buf = val % (LL)M; if (buf < 0) buf += M; return static_modint((ULL)buf); }

	static_modint operator-() const { if (x == 0) return 0; else return M - x; }
	static_modint& operator+=(static_modint r) { x += r.x; if (x >= M) x -= M; return *this; }
	static_modint operator+(static_modint r) const { static_modint res = x; return res += r; }
	static_modint& operator-=(static_modint r) { x += M - r.x; if (x >= M) x -= M; return *this; }
	static_modint operator-(static_modint r) const { static_modint res = x; return res -= r; }
	static_modint& operator*=(static_modint r) { x = x * r.x % M; return *this; }
	static_modint operator*(static_modint r) const { return static_modint(x * r.x % M); }
	static_modint pow(ULL r) const {
		if (r == 0) return static_modint(1);
		static_modint res = pow(r / 2);
		res *= res;
		if (r % 2) res *= *this;
		return res;
	}
	static_modint inv() const { return pow(M - 2); }
	static_modint& operator/=(static_modint r) { *this *= r.inv(); return *this; }
	static_modint operator/(static_modint r) const { return *this * r.inv(); }
	ULL& operator*() { return x; }
	const ULL& operator*() const { return x; }
	bool operator==(static_modint r) const { return x == *r; }
	bool operator!=(static_modint r) const { return x != *r; }
};

using MLL = static_modint<998244353>;

int main(){
  int N; ULL K; cin>>N>>K;
  MLL A = 0;
  rep(i,N){ int a; cin>>a; A+=a; }
  A *= MLL(2).pow(K);
  cout<<*A<<endl;
  return 0;
}