diff --git a/computer-science/01-introduction-to-cs-and-programming-mit/README.md b/computer-science/01-introduction-to-cs-and-programming-mit/README.md
index 7a222d6..50508f6 100644
--- a/computer-science/01-introduction-to-cs-and-programming-mit/README.md
+++ b/computer-science/01-introduction-to-cs-and-programming-mit/README.md
@@ -3,8 +3,8 @@
 ## Unit 1
 
 - INTRODUCTION TO 6.00 ✔
-- CORE ELEMENTS OF A PROGRAM ✍
-- PROBLEM SOLVING
+- CORE ELEMENTS OF A PROGRAM ✔
+- PROBLEM SOLVING ✍
 - MACHINE INTERPRETATION OF A PROGRAM
 - OBJECTS IN PYTHON
 - RECURSION
diff --git a/computer-science/01-introduction-to-cs-and-programming-mit/src/02-lecture.js b/computer-science/01-introduction-to-cs-and-programming-mit/src/02-lecture.js
new file mode 100644
index 0000000..862edae
--- /dev/null
+++ b/computer-science/01-introduction-to-cs-and-programming-mit/src/02-lecture.js
@@ -0,0 +1,53 @@
+//// Create a variable x and assign value 3 to it
+//var x = 3;
+//
+//// Bind x to value 9
+//x *= x; // or x = x * x;
+//console.log( x );
+
+//// read input data from terminal
+//process.stdin.resume();
+//
+//console.log( 'Enter a number:' );
+//process.stdin.setEncoding( 'utf8' );
+//
+//process.stdin.on( 'data', function( input ) {
+//
+//  console.log( typeof( input ));
+//  console.log( input );
+//
+//  process.exit();
+//
+//});
+
+// Verify if a integer number is even or odd.
+// If odd, verify if the number is divisible by 3
+// read input data from terminal
+process.stdin.resume();
+
+console.log( 'Enter a integer:' );
+process.stdin.setEncoding( 'utf8' );
+
+process.stdin.on( 'data', function( input ) {
+
+  var int = parseInt( input, 10 );
+
+  if ( int % 2 === 0 ) {
+
+    console.log( 'Even' );
+
+  } else {
+
+    console.log( 'Odd' );
+
+    if ( int % 3 !== 0 ) {
+
+      console.log( 'And not divisible by 3' );
+
+    }
+
+  }
+
+  process.exit();
+
+});
\ No newline at end of file