Theatre Square in the capital city of Berland has a rectangular shape with the size n × m meters. On the occasion of the city's anniversary, a decision was taken to pave the Square with square granite flagstones. Each flagstone is of the size a × a. What is the least number of flagstones needed to pave the Square? It's allowed to cover the surfa…

theatre.java

import java.util.Scanner;

public class theatre {
  public static void main(String[] args) {
		 double n,m,a;
		 Scanner in = new Scanner(System.in);

		     
		      n =  in.nextDouble();   // accept width of theatre square
		      m = in.nextDouble();   //accept length of theatre square
		      a = in.nextDouble();   //accept side of flagstone
		 
		      System.out.println((long)Math.ceil(n/a)*(long)Math.ceil(m/a) );
		      
		 }

}