#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) ({ulong _z=v;do*--wp=_z%10+48;while(_z/=10);})
#define wt1(v) ({char wbuf[64],*wp=wbuf+sizeof wbuf;wt(v);write(1,wp,wbuf+sizeof wbuf-wp);})
#define rep(v,e) for(typeof(e) v=0;v<e;++v)
#define MD 998244353

typedef unsigned long ulong;

const p2[]={2,4,16,256,65536,301989884,932051910,299560064,169907034,60241440,595200811,819041188,954185916,830057642,679814667,167578608,683753077,918327899,};

int main(){
	rd_init();
	long n=rd();
	ulong z=0;
	rep(i,n){
		z+=(i+2)*rd()<<(rp[-1]==10);
		z%=MD;
	}
	for(int a=0;n;n>>=1,++a){
		z=n&1?z*p2[a]%MD:z;
	}
	z=z*873463809%MD;
	wt1(z);
	_exit(0);
}