private void textBox5_TextChanged(object sender, System.EventArgs e)
		{
			try
			{
				double itog;
				double _ye;
				double zach;
 
				if(textBox5.Text != "") itog = Convert.ToDouble(textBox5.Text);
				else itog = 0;
			
				this.initil();

				zach = (itog - (itog*this.pers/100.0));
				_ye = zach/this.ye; 

				textBox3.Text = zach.ToString();
				textBox4.Text = _ye.ToString();
			}
			catch(Exception ex)
			{
				MessageBox.Show(ex.ToString());
			}
		}

		private void initil()
		{
			this.ye = Convert.ToDouble(textBox1.Text);
			this.pers = Convert.ToDouble(textBox2.Text);
		}