public void read_input(String file_name)
	{
		File file = new File(System.getProperty("user.dir") + "/inputs/" + file_name);
		BufferedReader file_reader = null;

		try
		{
    		file_reader = new BufferedReader(new FileReader(file));
    		String line;
    		while( (line = file_reader.readLine()) !=  null)
    			parse_line(line);
    	}
    	catch (FileNotFoundException e)
    	{
    		e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		finally
		{
		    try
		    {
		        if (file_reader != null)
		            file_reader.close();
		    }
		    catch (IOException e)
		    {
				e.printStackTrace();
		    }
		}
	}