N = int(input())
pow2 = 1
ans = 0
A = list(map(int, input().split()))
A.sort(reverse = True)
x = 0
f = 0
while x < N:
    for i in range(pow2):
        ans += f * A[x]
        x += 1
    f += 1
    pow2 *= 2
print(ans)