#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n; 
    scanf("%d",&n);
    int *calories = malloc(sizeof(int) * n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       scanf("%d",&calories[calories_i]);
    }
    int miles=0;
    //descending order sort
    int minc;
    for(int i=0;i<n ;i++){
        for(int j=i;j<n;j++){
            if(calories[j+1]>calories[j]){
                minc = calories[j+1];
                calories[j+1]=calories[j];
                calories[j]=minc;
            }
        }
    }
    //sorted in desc
    
    for(int count=0;count<n ; count++){
        miles+=calories[count]*pow(2,count);
    }
    printf("%d",miles);
    return 0;
}