diff --git a/a1/program.c b/a1/program.c
index ec8c068..cdddc3f 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -8,55 +8,62 @@ int main() {
     double num1, num2, result, expected_result;
     char op;
 
-    // Read the input line
-    fgets(line, sizeof(line), stdin);
-
-    // Remove any spaces between symbols
-    for (int i = 0; line[i] != '\0'; i++) {
-        if (isspace(line[i])) {
-            for (int j = i; line[j] != '\0'; j++) {
-                line[j] = line[j + 1];
-            }
-            i--; // Move back one step to recheck the current character
+    while (fgets(line, sizeof(line), stdin) != NULL) {
+        if (line[0] == '\n') {
+            // Stop when the user enters a blank line
+            break;
         }
-    }
 
-    // Parse the line
-    sscanf(line, "%lf%c%lf=%lf", &num1, &op, &num2, &expected_result);
+        num1 = num2 = result = 0;
+        op = '\0';
 
-    // Check if the input is valid
-    if (op != '+' && op != '-' && op != '*' && op != '/') {
-        printf("CHYBA\n");
-        return 1;
-    }
+        // Remove any spaces between symbols
+        for (int i = 0; line[i] != '\0'; i++) {
+            if (isspace(line[i])) {
+                for (int j = i; line[j] != '\0'; j++) {
+                    line[j] = line[j + 1];
+                }
+                i--; // Move back one step to recheck the current character
+            }
+        }
 
-    // Check for division by zero
-    if (op == '/' && num2 == 0) {
-        printf("ZLE\n");
-        return 0;
-    }
+        // Parse the line
+        sscanf(line, "%lf%c%lf=%lf", &num1, &op, &num2, &expected_result);
 
-    // Perform the calculation
-    switch (op) {
-        case '+':
-            result = num1 + num2;
-            break;
-        case '-':
-            result = num1 - num2;
-            break;
-        case '*':
-            result = num1 * num2;
-            break;
-        case '/':
-            result = num1 / num2;
-            break;
-    }
+        // Check if the input is valid
+        if (op != '+' && op != '-' && op != '*' && op != '/') {
+            printf("CHYBA\n");
+            continue;
+        }
 
-    // Check if the result is correct
-    if (result == expected_result) {
-        printf("OK\n");
-    } else {
-        printf("ZLE\n");
+        // Check for division by zero
+        if (op == '/' && num2 == 0) {
+            printf("ZLE\n");
+            continue;
+        }
+
+        // Perform the calculation
+        switch (op) {
+            case '+':
+                result = num1 + num2;
+                break;
+            case '-':
+                result = num1 - num2;
+                break;
+            case '*':
+                result = num1 * num2;
+                break;
+            case '/':
+                result = num1 / num2;
+                break;
+        }
+
+        // Check if the result is correct
+        if (result == expected_result) {
+            printf("OK\n");
+        } else {
+            printf("ZLE\n");
+        }
     }
 
     return 0;