Java :

import java.util.Scanner;


public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		double v = input.nextDouble();
		double a = input.nextDouble();
		double l=Math.round(v*v*1000/(2*a))/1000.0;
		System.out.println("The minimum runway length for this airplane is "+l);
	}

}