const fi='thamso.inp';
fo='kq.inp';
var f1,f2:text;
a,b,c,delta:real;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,a,b,c);
delta:=sqr(b)-4*a*c;
if delta>0 then
begin
writeln(f2,'Nghiem thu nhat la: ',(-b-sqrt(delta))/2*a:4:2);
writeln(f2,'Nghiem thu hai la: ',(-b+sqrt(delta))/2*a:4:2);
end;
if delta=0 then writeln(f2,'Nghiem cua phuong trinh la: ',-b/2*a:4:2);
if delta<0 then writeln(f2,'Phuong trinh vo nghiem');
close(f1);
close(f2);
end.