Factorial without multiplication shit!!!!

/*
     *
     *  Name: Sean Myko C. Baang
     *  Section: CC11 - CCB
     *  Date: 07/17/2018
     *
*/

// Description...

/*  Factorial without using multiplication */
/* I almost died */


import java.util.Scanner;

class FactorialProgram
{

    public static void main(String args[])
    {

        Scanner reader = new Scanner(System.in); // Userinput shit...
        System.out.println("[INPUT NUMBER]: ");
        int n = reader.nextInt();
        System.out.println("");

        if(n < 0)
        {
            System.out.println( "[ERROR]: userinput is less than 0." );     // Prints error if userinput is less than 0...
        }

        if(n == 0)
        {
            n = 1;
            System.out.println( "[FACTORIAL]: " + n );      // Prints the Factorial of n equals to 0...
        }
        else
        {

            int x = 1;
            int y = n;
            int z = 0;

            if (y == 1)
            {
                System.out.println( "[FACTORIAL]: "  +  n ); // Prints if y is equal to 1...
            }
            else
            {
                while(y != 1) // Loops y not equal to 1...
                {
                    y = y - 1;
                    x = y;


                    while(y != 1) // While y is not equal to zero, it checks if x is either equal to 0 and vice versa...
                    {
                        if(x != 0)
                        {
                            z = z + n;
                            x = x - 1;
                        }
                        else
                        {
                            y = y - 1;
                            x = y - 1;
                            n = z;
                        }
                    }

                }
                System.out.println("[FACTORIAL]: " + n);
                System.out.println("");
                System.out.println("[Coded by Sean Baang]");
                System.out.println("[07/17/2018]");
            }

        }

    }


}