diff --git a/src/makeRobotAccountant.js b/src/makeRobotAccountant.js
index 38b9758a..146cd00b 100644
--- a/src/makeRobotAccountant.js
+++ b/src/makeRobotAccountant.js
@@ -6,7 +6,23 @@
  */
 
 function makeRobotAccountant() {
-  // write code here
+  let calls = 0;
+
+  const innerFunction = function(y) {
+    return function(x) {
+      calls++;
+
+      if (calls <= 3 || calls % 2 !== 0) {
+        return x + y;
+      }
+
+      return 'Bzzz... Error!';
+    };
+  };
+
+  return function(x) {
+    return innerFunction(x);
+  };
 }
 
 module.exports = makeRobotAccountant;