diff --git a/src/ScientificCalculator.java b/src/ScientificCalculator.java
new file mode 100644
index 0000000..eceddf7
--- /dev/null
+++ b/src/ScientificCalculator.java
@@ -0,0 +1,13 @@
+public class ScientificCalculator {
+    public long factorial(int n) {
+        if (n < 0) {
+            throw new IllegalArgumentException("Факториал не определён для отрицательных чисел");
+        }
+        long result = 1;
+        for (int i = 2; i <= n; i++) {
+            result *= i;
+        }
+        return result;
+    }
+}
+