diff --git a/du4/program.c b/du4/program.c
index ca682f1..ba68395 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -1,22 +1,24 @@
 #include <stdio.h>
 
 int main(){
-    char read[1000000];
-    scanf("%[^\n]", read);
-    float num1, num2, answer;
-    char action;
-    sscanf(read, "%f %c %f %*c %f", &num1, &action, &num2, &answer);
-    if(action != '/' && action != '*' && action != '-' && action != '+'){
-        printf("CHYBA\n");
-        return 0;
+    while(1){
+        char read[1000000];
+        scanf("%[^\n]", read);
+        float num1, num2, answer;
+        char action;
+        sscanf(read, "%f %c %f %*c %f", &num1, &action, &num2, &answer);
+        if(action != '/' && action != '*' && action != '-' && action != '+'){
+            printf("CHYBA\n");
+            return 0;
+        }
+        float check = (action == '/') ? num1 / num2 : (action == '*') ? num1 * num2 : (action == '+') ? num1 + num2 : num1 - num2;
+        check *= 100000;
+        int tmp = check;
+        check = (float) tmp / 100000;
+        answer *= 100000;
+        tmp = answer;
+        answer = (float) tmp / 100000;
+        printf("%s\n", (check == answer) ? "OK" : "ZLE");
+        //printf("%f\n", check);
     }
-    float check = (action == '/') ? num1 / num2 : (action == '*') ? num1 * num2 : (action == '+') ? num1 + num2 : num1 - num2;
-    check *= 100000;
-    int tmp = check;
-    check = (float) tmp / 100000;
-    answer *= 100000;
-    tmp = answer;
-    answer = (float) tmp / 100000;
-    printf("%s\n", (check == answer) ? "OK" : "ZLE");
-    //printf("%f\n", check);
 }