n = gets.chomp.to_i
a = gets.chomp.split(" ").map(&:to_i)
a = a.sort
now_kai = 0
min_ans = 0
while true
    max = 2 ** now_kai
    i = 0
    ok = true
    while ok
        min_ans += a.pop * now_kai
        #print "{a}" + " " + "#{min_ans}" + " " +"#{now_kai}" +" "+"#{i}"+ "\n"
        i += 1
        ok = false if a == []
        break if max == i
        #i += 1
    end
    break if ok == false
    now_kai += 1
    #puts "^^^^^^^^^^^^^^"
end
puts min_ans