diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..cac3c65 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,21 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
-}
\ No newline at end of file
+  if (value < 1) return 0
+  if (value <= 2) return 1
+  let result = 0
+  let result2  = 1
+  let resultado = value
+  for ( let i =2; i <=value; i++){
+    resultado = result2 + result
+    result = result2
+    result2 =resultado
+  }
+  return resultado
+}
+console.log(fibonacci(0))
+console.log(fibonacci(1))
+console.log(fibonacci(2))
+console.log(fibonacci(3))
+console.log(fibonacci(4))
+console.log(fibonacci(5))
+console.log(fibonacci(6))
\ No newline at end of file