import java.util.Scanner;
public class sensFinder {
	public static Scanner scan = new Scanner(System.in);
	public static double first;
	public static double low;
	public static double high;

	public static void main(String[] args) {
		System.out.println("Start by finding our starting point");
		System.out.println("To do this, find the sensitivity you need to do a full 360");
		System.out.println("while also using your entire surface");
		System.out.println("What is this starting number?");
		first = scan.nextDouble();
		for (int i = 0; i < 5; i++) {
			low = first*0.5;
			high = first*1.5;
			System.out.println("Now, try a sensitivity of a: "+low);
			System.out.println("Then b: "+high);
			System.out.println("Which do you prefer, a or b?");
			String check = scan.next();
			if (check.equalsIgnoreCase("a")) first = (first + low)/2;
			if (check.equalsIgnoreCase("b")) first = (first + high)/2;
		}
		System.out.println("");
		System.out.println("Your final sensitivity is: "+first);

	}
}