program exisosi_a_bathmou2;
uses crt;
var
a,b,x:real;
BEGIN
clrscr;
write('dose mou to a=');
readln(a);
write('dose mou kai to b=');
readln(b);
if a<>0 then
begin
x:=-b/a;
writeln('x= ',x:1:2);
end
else if b<>0 then
writeln('adynato')
else writeln('aoristo');
readln;
END.