diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..34e2e43 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,7 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
-}
\ No newline at end of file
+  if(value <= 1){
+    return value
+  }
+  return fibonacci(value - 1) + fibonacci(value - 2)
+}