diff --git a/proglabs/lab6/9.c b/proglabs/lab6/9.c
index 5afb800..559e57a 100644
--- a/proglabs/lab6/9.c
+++ b/proglabs/lab6/9.c
@@ -14,13 +14,12 @@ int main() {
 }
 
 int pr(long long x) {
-    if (x < 2) return 0;
-    if (x == 2 || x == 3) return 1;
-    if (x % 2 == 0 || x % 3 == 0) return 0;
+    if (n < 2) return 0;
+    if (n == 2 || x == 3) return 1;
+    if (n % 2 == 0 || n % 3 == 0) return 0;
 
-    for (long long i = 5; i * i <= x; i += 6) {
-        if (x % i == 0 || x % (i + 2) == 0)
-            return 0;
-    }
+    for (long long i = 5; i * i <= n; i += 6) {
+        if (n % i == 0 || n % (i + 2) == 0)
+            return 0;}
     return 1;
 }