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using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        int c = 0;
        double d;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            c = c + 1;
            d = c % 10;
            button1.Text = d.ToString("0.0");
            if (d <= 3)
            { button1.BackColor = System.Drawing.Color.FromName("Red");
            button2.BackColor = System.Drawing.Color.FromName("White");
            button3.BackColor = System.Drawing.Color.FromName("White");
            }
            else if (d > 3 && d <= 5)
            {
                button1.BackColor = System.Drawing.Color.FromName("White");
                button2.BackColor = System.Drawing.Color.FromName("Yellow");
                button3.BackColor = System.Drawing.Color.FromName("White");
            }
            else
            {
                button1.BackColor = System.Drawing.Color.FromName("White");
                button2.BackColor = System.Drawing.Color.FromName("White");

                button3.BackColor = System.Drawing.Color.FromName("Green");

        }
    }
}
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