using System;
namespace For39262
{
internal class Program
{
private static void Main(string[] args)
{
Console.WriteLine("Here we go...");
int[] A = new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
int K = 3;
if ((K<1) || (K>A.Length) )
{
Console.WriteLine("error on input data");
Console.Read();
return;
}
for(int i=K;i<A.Length; i+=K) Console.WriteLine(A[i]);
Console.Read();
}
}
}
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