diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..c16fc61 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,8 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
+  if (value === 0 || value === 1) {
+    return value;
+  } else {
+    return fibonacci(value - 1) + fibonacci(value - 2);
+  }
 }
\ No newline at end of file