n = int(input())
*a, = map(int,input().split())
a.sort(reverse=1)
c = ans = 0
for k in range(20):
    d = 1<<k
    for i in range(c,c+d):
        if i >= n: break
        ans += a[i]*k
    c += d
    if c >= n: break
print(ans)