diff --git a/src/Lesson1/CBV_vs_CBN.sc b/src/Lesson1/CBV_vs_CBN.sc
new file mode 100644
index 0000000..d385f10
--- /dev/null
+++ b/src/Lesson1/CBV_vs_CBN.sc
@@ -0,0 +1,10 @@
+def firstCBV(x: Int, y: Int): Int = x
+
+def firstCBN(x: Int, y: => Int): Int = x
+
+def loop: Int = loop
+
+firstCBV(4, 5)
+firstCBN(4, 5)
+firstCBN(4, loop)
+//firstCBV(4, loop)