local n = io.read("*n")
local a = {}
for i = 1, n do a[i] = io.read("*n") end
table.sort(a, function(x, y) return x > y end)
local ret = 0
local lim = 2
local dig = 0
for i = 1, n do
  if lim == i then
    dig = dig + 1
    lim = lim * 2
  end
  ret = ret + a[i] * dig
end
print(ret)