static Random rnd = new Random();
        Point p = new Point();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            p.X = rnd.Next(20, 400);
            p.Y = rnd.Next(20, 400);
        }

        private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 20)
            {
                this.BackColor = Color.Black;
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   10!";
                MessageBox.Show("Поздравление!");
                p.X = rnd.Next(20, 400);
                p.Y = rnd.Next(20, 400);
                this.BackColor = Color.White;
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур";

            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 30 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 20) {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   9!";
                this.BackColor = Color.Gray;
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 40 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 30) {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   8!";
                this.BackColor = Color.FromArgb(169, 169, 169);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 50 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 40)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   7!";
                this.BackColor = Color.FromArgb(185, 185, 185);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 60 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 50)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   6!";
                this.BackColor = Color.FromArgb(192, 192, 192);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 70 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 60)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   5!";
                this.BackColor = Color.FromArgb(200, 200, 200);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 80 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 70)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   4!";
                this.BackColor = Color.FromArgb(207, 207, 207);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 90 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 80)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   3!";
                this.BackColor = Color.FromArgb(211, 211, 211);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 100 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 90)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   2!";
                this.BackColor = Color.FromArgb(215, 215, 215);
            }
            if (Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) <= 110 && Math.Sqrt((p.X - e.X) * (p.X - e.X) + (p.Y - e.Y) * (p.Y - e.Y)) > 100)
            {
                this.Text = "Лаб.Раб. №1_3. Тугалов Тимур" + "   1!";
                this.BackColor = Color.FromArgb(220, 220, 220);
            }

        }