doing project but for some reason cycle doesn't work

Question

i'm drawing rectangles in line, and every turn it's supposed to delete one rectangles every turn, until i wont be less than 1, but for some reason it's only deleting one rectangle and thats it, what am i doing wrong?

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        int i;
        int j;
        int h = 0;
        int w = 0;
        int x = 0;
        int y = 0;
        public Form1()
        {
            InitializeComponent();
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            Graphics gr = panel1.CreateGraphics();
            {
                
                    for (i = 5; i > 1; i--)
                    {
                        
                            gr.DrawRectangle(Pens.Black, x, 70 + y, 60 + h, 60 + w);
                            x += 70;                    
                    }
                    x = 0;
                    y += 70;
               
            }
        }
    }
}

form1