diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..4530f54 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,14 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
+  let fibM = value;
+  let fibMinus1 = 0;
+  let fibMinus2 = 1;
+
+
+  for (let i = 0; i < value; i++) {
+    fibM = fibMinus1 + fibMinus2;
+    fibMinus1 = fibMinus2;
+    fibMinus2 = fibM;
+  }
+  return fibMinus1
 }
\ No newline at end of file