Assignemnt #76 and 74th program

Code

  ///Name: Derrick Andreasen
///Period: 7
///Program name: 74th Program
///File name: Sev4Prog.java
///Date Finished:12/10/2015

import java.util.Scanner;

import java.util.Random;

public class Sev4Prog
{
	public static void main( String[] args )
	{
    
        Scanner keyboard = new Scanner(System.in);
        
        int n;
        int z=0;
        
        System.out.print( "Starting number: " );
        n = keyboard.nextInt();
        
        while (n < 0)
        {
          System.out.println( n + " is not a natural number. Try again." );
            n = keyboard.nextInt();
        }
        
        while (n != 1)
        {
            if(n%2 == 0)
            {
                n = (n/2);
                System.out.print(n + "\t");
                z++;
            }
            else
            {
                n = ((3*n)+1);
                System.out.print(n + "\t");
                z++;
            }
        }
        
        System.out.println( "\n\nTerminated after " + z + " steps." );
    }
}

Picture of the output