using System;

namespace ConsoleApplication

{

    class Program

    {

        int i, n;

 private void dataGridView1_MouseClick(object sender, MouseEventArgs e)

 {

 n = int.Parse(textBox1.Text);

 dataGridView1.RowCount = n;

 dataGridView1.ColumnCount = 1;

 }

 private void button1_Click(object sender, EventArgs e)

 {

 int[] X = new int[20];

 for (i = 0; i < n; i++)

 X[i] = Convert.ToInt32(dataGridView1[0, i].Value);

 int br = 0;

 for (i = 0; i < n; i++)

 {

 if (X[i] % 3 != 0)

 {

 X[br++] = X[i];

 dataGridView1[0, i].Value = "";

 listBox1.Items.Add("X[" + i + "]= " + X[i]);

 }

 }

 }

}

}