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

char*mmap();
#define rd(v) long v=0;{long _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {long _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(long v=0;v<e;++v)
#define chmin(v,a) (v=v<=a?v:a)

#define MD 998244353

int a[200000];

long f1(){
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd(n);
	long s=0,x=0;
	rep(i,n){
		rd(ai);
		a[i]=ai;
		s+=ai;
		x^=ai;
	}
	if(x){
		long m=s;
		rep(i,n){
			chmin(m,(x^a[i])-a[i]);
		}
		s+=m+1;
	}
	return s;
}

long f2(long s){
	long e=(MD*2-1)/3;
	long z=1;
	while(s){
		if(s&1){
			z=z*e%MD;
		}
		s>>=1;
		e=e*e%MD;;
	}
	return (1+MD-z)*((MD+1)/2)%MD;
}

void f3(long z){
	char wbuf[64],*wp=wbuf+sizeof wbuf;
	wt(z);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}

main(){
	f3(f2(f1()));	
}