n = int(input())
list_a = list(map(int, input().split()))
list_a = sorted(list_a)
list_a.reverse()
cost = 0
f = 0
m = 0
for i in list_a:
    cost = cost + i * f
    m += 1
    if m == 2**(f+1) - 1:
        f += 1
print(cost)