var express = require('express');

var cookie  = require('cookie-parser')

var app = express();

app.use(cookie());

app.get('/', function(req, res){

    var counter =  parseInt(req.cookies.counter || "") || 0;

    res.cookie('counter', counter + 1);

    if (counter >= 5) {

        res.write('You are a valued customer ' + 

                  'visting the site ' + counter + ' times.');

    } else {

        res.write('This is visit number '+ counter +'!');

    }

    res.end();

});

app.listen(8000);