diff --git a/starter-code/.gitignore b/starter-code/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/starter-code/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/starter-code/calculadora.js b/starter-code/calculadora.js
new file mode 100644
index 0000000..c8e0a6c
--- /dev/null
+++ b/starter-code/calculadora.js
@@ -0,0 +1,32 @@
+// Initial code
+const readlineSync = require('readline-sync');
+const {sum, Subtraccion, Multiplication, Division} = require ('./math');
+
+
+const operations = ['sum', 'Substraction','Multiplication', 'Division' ];
+const index = readlineSync.keyInSelect( operations, 'Witch operations do you want');
+let firtsNumber
+let secondNumber
+if (index != -1) {
+        firtsNumber = readlineSync.questionInt('Input firts number: ');
+        secondNumber = readlineSync.questionInt('Input second number: ');
+}
+
+switch(index) {
+    case 0:
+    console.log(sum(firtsNumber, secondNumber));
+    break;
+    case 1:
+    console.log(Substraction(firtsNumber, secondNumber));
+    break;
+    case 2:
+    console.log(Multiplication(firtsNumber, secondNumber));
+    break;
+    case 3:
+    console.log(Division(firtsNumber, secondNumber));
+    break;
+    default: 
+    console.log('Nothing!');
+    break;
+}
+
diff --git a/starter-code/index.js b/starter-code/index.js
index d3eae77..8de3513 100644
--- a/starter-code/index.js
+++ b/starter-code/index.js
@@ -1,2 +1,23 @@
 // Initial code
-console.log('Welcome to Node.js');
+const http = require ('http'); 
+
+// Creating server
+
+// const server = http.createServer((req, res) => {
+//     res.end('Bienvenidos a Node.js!');
+// })
+
+// Server listening
+
+// server.listen('8080')
+
+http.createServer((req, res) => {
+    res.writeHead(200, { 'Content-Type': 'Text/html' });
+
+    res.end('<p>Bienvenidos a Node.js!</p><h2>Subtitle</h2>');
+})
+.listen('8080')
+
+console.log('Node Application listening on port 8080');
+
+
diff --git a/starter-code/math.js b/starter-code/math.js
new file mode 100644
index 0000000..2d0a3d9
--- /dev/null
+++ b/starter-code/math.js
@@ -0,0 +1,25 @@
+// Const Module
+
+// Sum
+const sum = (x , y) => x + y;
+
+// Subtraccion
+
+const Subtraccion = (x , y) => x - y;
+
+// Multiplication
+
+const Multiplication = (x , y) => x * y;
+
+// Division
+
+const Division = (x , y) => x / y;
+
+
+module.exports = {
+sum,
+Subtraccion,
+Multiplication,
+Division,
+
+};
diff --git a/starter-code/package-lock.json b/starter-code/package-lock.json
new file mode 100644
index 0000000..4fbdf7e
--- /dev/null
+++ b/starter-code/package-lock.json
@@ -0,0 +1,13 @@
+{
+  "name": "starter-code",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "readline-sync": {
+      "version": "1.4.9",
+      "resolved": "https://registry.npmjs.org/readline-sync/-/readline-sync-1.4.9.tgz",
+      "integrity": "sha1-PtqOZfI80qF+YTAbHwADOWr17No="
+    }
+  }
+}
diff --git a/starter-code/package.json b/starter-code/package.json
index ce4be49..790ff72 100644
--- a/starter-code/package.json
+++ b/starter-code/package.json
@@ -3,5 +3,8 @@
   "version": "0.0.1",
   "scripts": {
     "start": "node index.js"
+  },
+  "dependencies": {
+    "readline-sync": "^1.4.9"
   }
-}
\ No newline at end of file
+}