import java.util.*;

public class BodyMassIndex {
    public static final int BMI_FACTOR = 703;

    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        
        double bmi1 = processPerson(console);
        double bmi2 = processPerson(console);
        
        System.out.println("Person #1 body mass index = " + bmi1);
        System.out.println("Person #2 body mass index = " + bmi2);
        
        System.out.println("Difference = " + (bmi1 - bmi2));
    } 
    
    public static double processPerson(Scanner console) {
        System.out.println("Enter next person's information:");
        System.out.print("height (in inches)? ");
        double height = console.nextDouble();
        System.out.print("weight (in pounds)? ");
        double weight = console.nextDouble();
        System.out.println();
        
        return calculateBMI(weight, height);
    }
    
    public static double calculateBMI(double weight, double height) {
         double bmi = weight / Math.pow(height, 2) * BMI_FACTOR;
         return bmi;     
    }
}