wrong answer

#include<stdio.h>
#include<stdlib.h>
int main()
{
int x; float y;
scanf("%d %f",&x,&y);

if((0<=x && x<=2000) && (0.00<=y && y<=2000.00))
{
if(x%5==0)
{
if(x>=y)
printf("%.2f\n",y);
else
{
y=y-x-0.50;
printf("%.2f\n",y);
//printf(“hello”);
}
}
else
printf("%.2f\n",y);
}
else
exit(0);
return 0;

}