diff --git a/lab2_2.c b/lab2_2.c
new file mode 100644
index 0000000..44381a2
--- /dev/null
+++ b/lab2_2.c
@@ -0,0 +1,21 @@
+long long factorial(int n) {
+    long long result = 1;
+    for (int i = 1; i <= n; i++) {
+        result *= i;
+    }
+    return result;
+}
+
+int main() {
+    int n;
+    printf("Enter n: ");
+    scanf("%d", &n);
+
+    if (n < 0) {
+        printf("Error: n must be >= 0\n");
+    } else {
+        printf("%d! = %lld\n", n, factorial(n));
+    }
+
+    return 0;
+}