diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..6ced933 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,13 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
-}
\ No newline at end of file
+    let soma = 0;
+    let anterior = 0;
+    let proximo = 1;
+
+    for (let i = 0; i < value; i++) {
+      soma = anterior + proximo;
+      anterior = proximo;
+      proximo = soma;
+    }
+    return anterior;
+}