#include <iostream>
#include <algorithm>

using namespace std;

int main(int argc, const char * argv[]) {
    long long n, c[40], res = 0;
    cin >> n;
    for (int i=0; i<n; ++i) {
        cin >> c[i];
    }
    sort(c, c+n);
    reverse(c, c+n);
    
    for (int i=0; i<n; ++i) {
        res += (((long long)1)<<i) * c[i];
    }
    
    cout << res;
    return 0;
}