#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const int MOD2=998244353;
ll modpow(ll a, ll b, ll p){ ll ans = 1; while(b){ if(b & 1) (ans *= a) %= p; (a *= a) %= p; b /= 2; } return ans; }
inline char tc(void){
	static char fl[10000],*A=fl,*B=fl;
	return A==B&&(B=(A=fl)+fread(fl,1,10000,stdin),A==B)?EOF:*A++;
}
inline int read(void){
	int a=0;char c;
	while((c=tc())<'0'||c>'9');
	while(c>='0'&&c<='9')a=a*10+c-'0',c=tc();
	return a;
}

int main(){
    int n,x;
    long long int k,sum=0;
    cin>>n>>k;
    while(n--){
        x=read();
        sum+=x;
    }
    printf("%lld\n",((sum%MOD2)*modpow(2,k,MOD2))%MOD2);
}