using System;

public class Program
{
    public static void Main()
    {
        int[] nums = new int[5];
        int a;
        int arraySeq;
        int target;
        bool reset = false;

        do
        {
			reset = false;
            for (arraySeq = 0; arraySeq < nums.Length; arraySeq++)
            {
                for (a = 1; a <= arraySeq; a++) { }

                Console.Write("insert the number #" + a + " = ");
                nums[arraySeq] = int.Parse(Console.ReadLine());
                for (int i = 0; i < arraySeq; i++)
                {
                    if (nums[arraySeq] == nums[i])
                    {
                        reset = true;
                        Console.WriteLine("You can't insert the same number");
                        Console.ReadKey();
                        Console.Clear();
                        break;
                    }
                    else
                    {
                        reset = false;
                    }
                }
                if(reset == true)break;
            }
        }while(reset == true);
    }
}