diff --git a/src/LAB2.c b/src/LAB2.c
index 0663998..908661d 100644
--- a/src/LAB2.c
+++ b/src/LAB2.c
@@ -15,8 +15,20 @@ void lab_2()
     printf("Enter [W_min]: ");
     READ_EXACT("%lf", w_min);
 
-    printf("Enter [W_max]: ");
-    READ_EXACT("%lf", w_max);
+    do
+    {
+        printf("Enter [W_max]: ");
+        READ_EXACT("%lf", w_max);
+
+        if (w_max < w_min)
+        {
+            printf("W_max cannot be less than W_min, try again\n");
+            continue;
+        }
+
+        break;
+    }
+    while (1);
 
     printf("Enter [d]: ");
     READ_EXACT("%d", d);