import ohjava.*;

public class p1 {

  public static void main (String args[]) {
    float yardLength, yardWidth, houseLength, houseWidth, 
           grassArea, time;
    String userInput;

    SimpleIO.prompt("Enter length of yard (in yards): ");
    userInput = SimpleIO.readLine();
    yardLength = Convert.toFloat(userInput);

    SimpleIO.prompt("Enter width of yard (in yards): ");
    userInput = SimpleIO.readLine();
    yardWidth = Convert.toFloat(userInput);

    SimpleIO.prompt("Enter length of house (in yards): ");
    userInput = SimpleIO.readLine();
    houseLength = Convert.toFloat(userInput);

    SimpleIO.prompt("Enter width of house (in yards): ");
    userInput = SimpleIO.readLine();
    houseWidth = Convert.toFloat(userInput);

    grassArea = (0.91f * yardLength * 0.91f * yardWidth) -
                (0.91f * houseLength * 0.91f * houseWidth);
 
    time = grassArea / (2.3f * 60);

    System.out.print("Time required to cut the grass is: ");
    System.out.print(Math.ceil(time));
    System.out.println(" minutes");

  }
}