program z1;
var x,y:real;
begin
write('x = ');
readln(x);
if x>7 then write ('y = ',1/(x*x-4))
else write('y = ',3*x-9)
end.
program z1;
var x,y:real;
begin
write('x = ');
readln(x);
if x>7 then write ('y = ',1/(x*x-4))
else write('y = ',3*x-9)
end.