#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
int cmpr(const void *a,const void *b)
{
return *(char *)a-*(char * )b;
}
int main(){
    int n, sum = 0; 
    scanf("%d",&n);
    int *calories = malloc(sizeof(int) * n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       scanf("%d",&calories[calories_i]);
       //sum += calories[calories_i] 
    }
    qsort(calories, n, sizeof(int), cmpr);
    for(int i = n - 1, j = 0; i > -1; i--) {
        sum += calories[i] * pow(2, j++);
    }
    printf("%d", sum);
    return 0;
}