program z1;
var x,a:real;
begin
write ('x = ');
readln (x);
write ('a = ');
readln (a);
writeln('y = ',sqrt((x*x+1)/(5*a)))
end.
program z1;
var x,a:real;
begin
write ('x = ');
readln (x);
write ('a = ');
readln (a);
writeln('y = ',sqrt((x*x+1)/(5*a)))
end.