diff --git a/src/index.ts b/src/index.ts
index 6b8af74..57741b7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,6 +2,10 @@ export function sum(numbers: number[]): number {
   return numbers.reduce((acc, value) => acc + value, 0);
 }
 
+export function multiply(numbers: number[]): number {
+  return numbers.reduce((acc, value) => acc * value, 1);
+}
+
 // eslint-disable-next-line unicorn/prefer-module
 if (require.main === module) {
   const MONDAY_COUNT = 1;
@@ -19,4 +23,14 @@ if (require.main === module) {
       FRIDAY_COUNT,
     ]),
   );
+
+  console.info(
+    multiply([
+      MONDAY_COUNT,
+      TUESDAY_COUNT,
+      WEDNESDAY_COUNT,
+      THURSDAY_COUNT,
+      FRIDAY_COUNT,
+    ]),
+  );
 }