import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

/**
 * Created by Abhilash on 14-02-2017.
 */
public class MarcsCakewalk {
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );
        int n = Integer.parseInt( br.readLine() );
        long num[] = new long[n];
        String[] nums = br.readLine().split( " " );
        for(int i=0;i<n;i++)
            num[i] = Long.parseLong( nums[i] );
        Arrays.sort(num);
        long ans = 0;
        for(int i=num.length-1;i>=0;i--){
            ans = ans + (num[i] * (long)Math.pow(2,num.length-i-1));
        }
        System.out.println(ans);
    }
}