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

int cmp(const void *a, const void *b){
    return (*(int *)b - *(int *)a);
}
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]);
    }
    qsort(calories,n, sizeof(int),cmp);
    long int miles = 0 ;
    for(int iter = 0;iter<n;iter++){
        miles = miles+((calories[iter])*pow(2,iter));
        //printf("%ld ",calories[iter]);
    }
    printf("%ld",miles);
    return 0;
}