Help me find out whats wrong in this solution

1

import java.util.;
import java.lang.;
import java.io.;
/ Name of the class has to be “Main” only if the class is public. */
class Codechef
{
public static void main (String[] args) throws IOException
{ BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
// your code goes here
try{
String[] ar = br.readLine().split(" ");
int x=Integer.parseInt(ar[0]);
double y=Double.parseDouble(ar[1]);
double charge=(50/100);

 if(x%5==0 && x+charge<=y)
 {
     y=y-(x+charge);
   	     System.out.println(String.format("%.2f",y));
 }
else
{ System.out.println(String.format("%.2f",y));
}
}

catch(Exception e)
{
return;
}
}
}