import java.util.Scanner;

public class Tiles
{
   public static void main(String[] args)
   {
      Scanner in = new Scanner(System.in);

      System.out.print("Total width: ");
      int totalWidth = in.nextInt();
      System.out.print("Tile width: ");
      int tileWidth = in.nextInt();

      int numberOfPairs = (totalWidth - tileWidth) / (2 * tileWidth);
      int numberOfTiles = 1 + 2 * numberOfPairs;
      double gap = (totalWidth - numberOfTiles * tileWidth) / 2.0;

      System.out.println("Number of tiles: " + numberOfTiles);
      System.out.println("Gap at each end: " + gap);
   }
}