import java.util.Scanner;
class Universe
{ public static void main
(String[] args
) {
Scanner src
=new Scanner
(System.
in); float n1= src.nextFloat();
float n2 = src.nextFloat();
if(n1<=n2-0.50 && n1%5==0)
{
double n3= n2-n1-0.5;
}
else
}
}
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