diff --git a/src/makeRobotAccountant.js b/src/makeRobotAccountant.js
index 38b9758a..57305303 100644
--- a/src/makeRobotAccountant.js
+++ b/src/makeRobotAccountant.js
@@ -6,7 +6,21 @@
  */
 
 function makeRobotAccountant() {
-  // write code here
+  let counter = 0;
+
+  return function(a) {
+    return function(b) {
+      counter++;
+
+      if (counter >= 4 && counter % 2 === 0) {
+        return `Bzzz... Error!`;
+      }
+
+      const sum = a + b;
+
+      return sum;
+    };
+  };
 }
 
 module.exports = makeRobotAccountant;