#include <bits/stdc++.h>

using namespace std;

typedef long long LL;
typedef double LD;

#define FOR(k,a,b) for(int k(a); k < (b); ++k)
#define FORD(k,a,b) for(int k(b-1); k >= (a); --k)
#define REP(k,a) for(int k=0; k < (a); ++k)
#define ABS(a) ((a)>0?(a):-(a))
#define EPS 1e-9
#define INF 1e9

int main(int argc, char** argv) {
#ifdef HOME
	freopen("in.txt", "rb", stdin);
	freopen("out.txt", "wb", stdout);
#endif
	int n;
	scanf("%d",&n);
	vector<LL> v(n);
	REP(i,n)
		scanf("%lld",&v[i]);
	sort(v.begin(),v.end());
	reverse(v.begin(),v.end());
	LL res = 0;
	REP(i,v.size())
	{
		res += (1LL << i)*v[i];
	}
	printf("%lld\n",res);
	return 0;
}