import acm.graphics.GRect;
import acm.program.GraphicsProgram;

import java.awt.*;

public class MethodicalPyramid extends GraphicsProgram {

    private static final int BRICK_H = 50;
    private static final int BRICK_L = 100;

    /**
     * Returns the color to be used for bricks in the given layer.
     *
     * @param layerIndex     index of the layer whose color to return. {@code 0} is the
     *                       bottom layer, {@code numberOfLayers - 1} is the top layer.
     * @param numberOfLayers the number of layers in the pyramid.
     * @return the color to be used for the given layer, or {@code null} if
     * {@code layerIndex} is invalid.
     */
    private Color layerColor(int layerIndex, int numberOfLayers) {
        if (layerIndex >= numberOfLayers || layerIndex < 0) {
            return null;
        } else if (layerIndex != 0) {
            int green;
            int blue = green = (220 / numberOfLayers * layerIndex);
            Color color = new Color(255, green, blue);
            return color;
        } else {
            return new Color(255, 0, 0);
        }
    }

    /**
     * Draws the given layer with bricks filled with the given color. If
     * {@code layerIndex} is invalid, no bricks at all should be drawn.
     *
     * @param layerIndex     index of the layer to draw. {@code 0} is the bottom layer,
     *                       {@code numberOfLayers - 1} is the top layer.
     * @param numberOfLayers the number of layers in the pyramid.
     * @param layerColor     color the layer's bricks should be filled with.
     */
    public void drawLayer(int layerIndex, int numberOfLayers, Color layerColor) {
        if (layerIndex >= numberOfLayers || layerIndex < 0) {
            //null;
        } else {
            int brickAmount = numberOfLayers - layerIndex;
            int x;
            int y = (BRICK_H * numberOfLayers) - (BRICK_H * layerIndex);
            for (int i = 0; brickAmount > i; i++) {
                x = 50 + (i * 100) + (layerIndex * 50);
                GRect brick = new GRect(x, y, BRICK_L, BRICK_H);
                brick.setFilled(true);
                brick.setColor(layerColor);
                add(brick);
            }
        }
    }


    public void run() {
        int n = readInt("Enter a number");
        for (int i =0; i <= n; i++){
            drawLayer(i,n,layerColor(i,n));
        }
    }

    public static void main(String[] args) {
        new MethodicalPyramid().start();
    }
}