#!/bin/python3

import os

def marcsCakewalk(calorie):
    # Sort the calorie list in descending order
    calorie.sort(reverse=True)
    
    # Initialize the total distance to 0
    total_distance = 0
    
    # Calculate the minimum distance Marc needs to walk
    for i in range(len(calorie)):
        total_distance += calorie[i] * (2 ** i)
    
    return total_distance

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    n = int(input().strip())

    calorie = list(map(int, input().rstrip().split()))

    result = marcsCakewalk(calorie)

    fptr.write(str(result) + '\n')

    fptr.close()