program Project1;
var y1,y2,y3:real;
a:real;
begin
write('vvedit chislo bolshee 0 a= ');
readln(a);
writeln;
y1:=-1/(a*a);
y2:=a*a;
y3:=4;
if a=0 then write('ne isnye') else
writeln('y1=',y1:6:2,' ','y2=',y2:6:2,' ','y3=',y3:6:2);
readln;
end.