diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..2667bbf 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,6 @@
 export function fibonacci(value) {
-  // implementar logica aqui
-  
+  if (value === 0 || value === 1){
+    return value;
+  }
+    return fibonacci(value -1) + fibonacci(value -2);
 }
\ No newline at end of file