import java.util.*;
class dash {
public static void main
(String[] args
) { Scanner in
= new Scanner
(System.
in); float x = in.nextFloat();
float y = in.nextFloat();
float a=x*x+y*y;
if((y<0)||(a>1)||((x>0)&&(a<0.3)))
{
} else
{
System.
out.
format("u=%f",x
*x
-1); }
}
}
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