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diff --git a/src/content/chapter1_functions/lesson01_recursion/code.gleam b/src/content/chapter1_functions/lesson01_recursion/code.gleam
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+import gleam/io
+
+pub fn main() {
+  io.debug(factorial(5))
+  io.debug(factorial(7))
+}
+
+// A recursive functions that calculates factorial
+pub fn factorial(x: Int) -> Int {
+  case x {
+    // Base case
+    1 -> 1
+
+    // Recursive case
+    _ -> x * factorial(x - 1)
+  }
+}