diff --git a/SimpleCalculator/Controllers/CalculatorController.cs b/SimpleCalculator/Controllers/CalculatorController.cs
index a9b97a4..8684fc3 100644
--- a/SimpleCalculator/Controllers/CalculatorController.cs
+++ b/SimpleCalculator/Controllers/CalculatorController.cs
@@ -1,8 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc;
 
 namespace SimpleCalculator.Controllers
 {
@@ -14,7 +10,9 @@ public class CalculatorController : ControllerBase
         [Route("add")]
         public ActionResult<double> Add(double x, double y)
         {
-            return x + y;
+            var result = x + y;
+            System.IO.File.AppendAllText(@"calculator.log",$"{result.ToString()}\n");
+            return result;
         }
 
         [HttpGet]