var
y,x:real;
begin
writeln('Введите значение x: ');
readln(x);
if x>0 then
writeln('y = ',(2*sqr(x)*x-1.7)/(x+8))
else
if x=0 then
writeln('y = ',0)
if x<0 then
writeln('y = ',1/7*x-4);
end.
