#include <cstdio>
#include <algorithm>

#define NMAX (40 + 7)
#define LL long long

using namespace std;
LL n, v[NMAX], sum, tmp;

int main()
{
    scanf("%lld", &n);
    for(LL i = 1; i<= n; ++i) scanf("%lld", &v[i]);
    sort(v+1, v+n+1);
    tmp = 1;
    for(LL i = n; i>= 1; --i)
    {
        sum += tmp * v[i];
        tmp <<= 1;
    }
    printf("%lld\n", sum);
    return 0;
}