#include <bits/stdc++.h>
using namespace std;

int main() {
  long long total = 0;
  long long arr[50];
  int N; scanf("%d", &N);
  for (int i = 0; i < N; ++i)
    scanf("%lld", &arr[i]);
  sort(arr,arr+N);
  reverse(arr,arr+N);
  for (int i = 0; i < N; ++i)
    total += ((1LL<<i)*arr[i]);
  printf("%lld\n",total);
  return 0;
}