Program Sqrt1;
uses crt;
Var A, B, C, D, X1, X2 : Real;
Begin
clrscr;
	Writeln ('vvedite a  ');
	Readln (A);
        writeln ('vvedi b');
        readln (B);
        writeln('vvedi c');
        readln(c);
	D:=B*B-4*A*C;
	if A<>0
	then
		Begin
			If D<0 Then Writeln ('korney net ')
			Else
				Begin
					X1:=(-B+SQRT(D))/2*A;
					X2:=(-B-SQRT(D))/2*A;
					If X1<>X2 then
						Writeln ('X1=', X1:8:3, ' X2=',X2:8:3)
					else  Writeln (' koren ','X=',X2:8:3);
				End;
		End
	else
Writeln('');
readln;
End.