#include <bits/stdc++.h>

using namespace std;

int a[333];

int main()
{
  int n;
  scanf("%d", &n);
  
  for (int i = 0; i < n; ++i) {
    scanf("%d", a + i);
  }
  
  sort(a, a + n, greater <int>());
  long long res = 0;
  for (int i = 0; i < n; ++i) {
    res += (1LL << i) * a[i];
  }
  
  printf("%lld\n", res);
  return(0);
}