class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string[] slipList = Console.ReadLine().Split(' ');
            int sum = slipSum(slipList);
            int money = 0;
            for (int i = 0; i < slipList.Length; i++)
            {
                if(sum >= int.Parse(slipList[i]))
                {
                    money += 30;
                }
            }
            Console.WriteLine(money);

        }

        private static int slipSum(string[] slipList)
        {
            int sum = 0;
            for(int i = 0; i < slipList.Length ; i++)
            {
                sum += int.Parse(slipList[i]);
            }
            return sum / 10;
        }
    }