diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..ab5ba8c 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,6 @@
 export function fibonacci(value) {
-  // implementar logica aqui
-  
-}
\ No newline at end of file
+    if(value < 2) {
+    return value
+    }
+    return fibonacci(value - 1) + fibonacci(value - 2)
+}