diff --git a/du4/program.c b/du4/program.c
index cbfc483..2272dd8 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -39,10 +39,10 @@ for(int i=0;el!='\n';i++){
 }
 sscanf(str,"%lF%c%lF=%lF ",&a,&ac,&b,&c);
 if(ac=='+')add(a,b,c,ac);
-if(ac=='-')subtr(a,b,c,ac);
-if(ac=='*')multi(a,b,c,ac);
-if(ac=='/')divi(a,b,c,ac);
-printf("CHYBA\n");
+else if(ac=='-')subtr(a,b,c,ac);
+else if(ac=='*')multi(a,b,c,ac);
+else if(ac=='/')divi(a,b,c,ac);
+else printf("CHYBA\n");
     return 0;
 }