package main
import ("fmt"
        "sort")

func main() {
  var n int
  fmt.Scan(&n)
  a := make([]int,n)
  for i := 0;i < n; i++ {
    fmt.Scan(&a[i])
  }
  sort.Sort(sort.Reverse(sort.IntSlice(a)))
  f := 0
  pow2 := 1
  ans := 0
  for i := 0;i < n;i ++ {
    ans += f * a[i]
    pow2 --
    if pow2 == 0 {
      f ++
      pow2 = 1<<f
    }
  }
  fmt.Print(ans)
}