regarding: HS08TEST problem in codechef showing !error.

#include<stdio.h>

#include<stdlib.h>
#include<math.h>

void main()

{

float y;

short x;
scanf("%d %f",&x,&y);
if(x<=0&&x>2000)
exit(0);
if(y<0&&y>2000)
exit(0);
if(x>y)
{
	printf("%0.2f",y);
}
else if(x%5!=0)
{
printf("%0.2f",y);	
}
else
{

y=y-x-0.50;

printf("%0.2f",y);

}

}

//