program xPro'
var x,a,y: real;
begin
readln(a,x);
if x>2 then y:=x*x-sin(a*x) 			else
if x<-2 then y:=sqrt(abs(sin(x*x)+a*x)) else
y:=(5*a+x)/(5*x-a);
writeln(y);
readln;
end.