diff --git a/src/calculator/script.js b/src/calculator/script.js
index 8f47950..b00de48 100644
--- a/src/calculator/script.js
+++ b/src/calculator/script.js
@@ -1,5 +1,4 @@
 const result = document.getElementById('result');
-const isNumber = (s) => /^\d+$/.test(s);
 
 function calculate(el) {
     if (el.value == '') {
@@ -29,4 +28,6 @@ const cyrb53 = (str, seed = 0) => {
     h2 ^= Math.imul(h1 ^ (h1 >>> 13), 3266489909);
     
     return 4294967296 * (2097151 & h2) + (h1 >>> 0);
-};
\ No newline at end of file
+};
+
+calculate(result); // this is necessary for parcel
\ No newline at end of file