import java.util.Scanner;
public class computepi {
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);

        double den = 1;
        double iteration = 1;
        double calcPi = 0;
        int user;
            /*prompt user input
    if input is valid, continue
    else request input again
    */
        System.out.println("put number");
        user = in.nextInt();
        if(user <=6 && user >= 1)
        {
            do
            {
                if(iteration % 2 ==0)
                {
                    //negative fraction
                    calcPi -= 1/den;
                }
                else
                {
                    //positive fraction
                    calcPi += 1/den;
                }
                iteration++;
                den += 2;
            }
            while(iteration <= 2);
        }
        System.out.println("~ alignment bar ~        1234567890abcdefghij");
        System.out.println("Computed value of π : " + calcPi*4);
        System.out.println("Expected value of π : " + Math.PI);
        System.out.println("Required iterations : " + iteration);
        System.out.println("Required threshold : ");
        System.out.println("Desired accuracy : " + user);

    }
}