diff --git a/calculator.html b/calculator.html
index 839b37e4..541b4409 100644
--- a/calculator.html
+++ b/calculator.html
@@ -2,6 +2,10 @@
 <title>Calculator</title><meta charset="utf-8">
 <script type="text/javascript">
 
+function cube() {
+  var num = document.getElementById("n1");
+  num.value = Math.pow(num.value, 3);
+}
 function square() {
   var num = document.getElementById("n1");
   num.value = num.value * num.value;
@@ -12,6 +16,7 @@
   Number:
   <input type="text" id="n1"><p>
 
-  <button onclick="square()"> x<sup>2</sup> </button>
+  <button onclick="cube()"> x<sup>3<sup></button>
+  <button onclick="square()"> x<sup>2<sup></button>
 </body>
 </html>
diff --git a/eje4opcionalaph.txt b/eje4opcionalaph.txt
new file mode 100644
index 00000000..5e061dd7
--- /dev/null
+++ b/eje4opcionalaph.txt
@@ -0,0 +1,13 @@
+git clone https://github.com/Alanstark19/cal_2com.git
+ls
+ls -a cal_2com
+cd cal_2com
+git status
+git log
+git branch mi_rama master
+git checkout mi_rama
+git add .
+git commit -m "x^3button"
+git log --oneline
+git push https://github.com/Alanstark19/cal_2com.git mi_rama
+history -w eje4opcionalaph.txt