using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NT_gyak
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] data = Console.ReadLine().Split(' ');
            int N = int.Parse(data[0]);
            int K = int.Parse(data[1]);
            int b = int.Parse(data[2]);
            int negatives = 0;
            string[] data2 = Console.ReadLine().Split(' ');
            List<int> numbers = new List<int>();
            for (int i = 0; i < N; i++)
            {
                numbers.Add(int.Parse(data2[i]));
                if (numbers[numbers.Count-1]<0)
                {
                    negatives++;
                }
            }
            numbers.Sort();
            for (int i = b; i < negatives; i++)
            {
                K += numbers[i];
                numbers[i] = 0;
            }
            while (K>0)
            {
                numbers.Sort();
                numbers[b]++;
                //Console.WriteLine(numbers[b+1]+" "+(b+1));
                K--;
            }
            int szorzat = 1;
            for (int i = 0; i < N; i++)
            {
                szorzat *= numbers[i];
            }
            Console.WriteLine(szorzat);
            Console.ReadKey();
        }
    }
}