n = int(input())
A = sorted(list(map(int,input().split())),reverse=True)
i = 0
cnt = 0
ans = 0
while True:
    if n - 2 ** i >= 0:
        for j in range(2 ** i):
            ans += i * A[cnt]
            cnt += 1
        n -= 2 ** i
    else:
        for j in range(n):
            ans += i * A[cnt]
            cnt += 1
        break
    i += 1
print(ans)