import java.io.*; import java.util.*; import java.text.*; import java.math.*; import java.util.regex.*; public class Solution { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int[] calories = new int[n]; for(int calories_i=0; calories_i < n; calories_i++){ calories[calories_i] = in.nextInt(); } long ans = 0; Arrays.sort(calories); for(int i=n-1;i>=0;i--) { ans += (long)calories[i]*Math.pow(2,n-i-1); //System.out.println((long)calories[i]*Math.pow(2,i)); } System.out.println(ans); } }