diff --git a/du3/program.c b/du3/program.c
index ce612d5..b5c401f 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -4,12 +4,12 @@
 
 int main() {
     char input[100];
-    if (fgets(input, sizeof(input), stdin) == NULL || input[0] == '\n') {
+   
+    if (fgets(input, sizeof(input), stdin) != NULL && input[0] == '\n') {
         return 0;
-    }
-
-    while (fgets(input, sizeof(input), stdin) != NULL && input[0] == '\n') {
-
+    }    
+    
+    
     double cislo1;
     double cislo2;
     double result;
@@ -17,6 +17,11 @@ int main() {
     char rovno;
     int colznakov = sscanf(input, "%lf %c %lf %c %lf", &cislo1, &znak, &cislo2, &rovno, &result);
 
+    if (colznakov != 5 || rovno != '=') {
+        printf("CHYBA\n");
+        return 0;
+    }
+
     double result2;
 
     switch (znak)
@@ -51,9 +56,5 @@ int main() {
             printf("Zle\n");
         }
     
-
-
-    
-    }
     return 0;
-}
\ No newline at end of file
+    }
\ No newline at end of file
diff --git a/du3/program.exe b/du3/program.exe
index fd6d94d..2977424 100644
Binary files a/du3/program.exe and b/du3/program.exe differ