diff --git a/du4/program.c b/du4/program.c
index 328e61b..df11859 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -4,11 +4,12 @@
 #include <ctype.h>
 
 int call( double A,  double B,  double C, char AC){
+     double cC=(double)C;
     if(AC=='/'&&B==0 || AC==('+'||'-'||'*'||'-')){
         return printf("CHYBA\n");
     }
     else if(AC=='+'){
-        if(A+B==C)return printf("OK\n");
+        if(A+B==C || C==cC)return printf("OK\n");
         return printf("ZLE\n");
     }
     if(AC=='-'){