var express = require('express');
        app = express.createServer();
    app.use(express.bodyParser());
    app.post('/', function(req, res){
      var i = req.param('1', null);
      var j = req.param('2', null);
      var k = req.param('3', null);
      var r = i+j+k;
      res.send(r);

    });