void setup() {
  
  size(500, 500);
  
  int n_circles = 5;
  int x_amp = width / n_circles;
  int y_amp = height / n_circles;
  int b = 1;
  int n = 1;
  int t = 1;

  for (int g_x = x_amp / 2; g_x <= width - x_amp / 2; g_x = g_x + x_amp) {
    for (int g_y = (y_amp / 2) * b; g_y <= height - ((y_amp / 2) * t); g_y = g_y + y_amp) {
      if (n % 2 == 0) {
        fill(0, 0, 175);
      } else {
        fill(175, 0, 0);
      };
      ellipse(g_x, g_y, x_amp, y_amp);
      fill(0);
      textSize(16);
      textAlign(CENTER, CENTER);
      text(n, g_x, g_y);
      n = n + 1;
    }
    t = t + 1;
    b = b + 1;
  }
  save("Assignment4_part3");
  
}