using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

        public int SmallestUnreachable()

        {

            var list = new List<int>();

            var stop = api.GetNumBills();

            for(int i=0; i<stop; i++)

            {

                    var current = api.GetBill(i);

                    list.Add(current);

                    var temp = list.ToArray();

                    for(int j =0; j< temp.Length -1; j++)

                    {

                        list.Add(temp[j] + current);

                    }

            }

            if(list.Count ==0)

            {

            return 1; }

            list.Sort();

            list.Distinct();

            for(int i=0; i< list.Count ; i++ )

            {

                if(list[i] != i+1)

                return i+1;

}

            return list.Last()+1;

        }

      public int MinBills()

        {

            var list = new List<int>();

            var result = new List<int>();

            var stop = api.GetNumBills();

            for(int i=0; i<stop; i++)

            {

                list.Add(api.GetBill(i));

            }

            var price =api.GetPrice();

            var pay = api.GetPayment();

            var substract = pay - price;

            if(substract<1)

return -1;

            var last = stop;

            while(substract != 0)

            {

                 if(substract - list[last-1] >= 0)

                {

                    substract = substract - list[last-1];

                    result.Add(list[last-1]);

                }

else

{

last --;

} }

            // Write your code here

            return result.Count;

        }

} }

}