 kostya79bat1 
                                                18.08.2019 02:30
                                                
                                                kostya79bat1 
                                                18.08.2019 02:30
                                             gordeevlogain2 
                                                26.08.2019 19:30
                                                
                                                gordeevlogain2 
                                                26.08.2019 19:30
                                             mariyayakovleva1 
                                                19.09.2019 10:50
                                                
                                                mariyayakovleva1 
                                                19.09.2019 10:50
                                             TkAl06 
                                                21.12.2020 14:00
                                                
                                                TkAl06 
                                                21.12.2020 14:00
                                             iakatya 
                                                21.12.2020 14:00
                                                
                                                iakatya 
                                                21.12.2020 14:00
                                             zajnabh35 
                                                21.12.2020 14:00
                                                
                                                zajnabh35 
                                                21.12.2020 14:00
                                             rootiopa2 
                                                21.12.2020 14:00
                                                
                                                rootiopa2 
                                                21.12.2020 14:00
                                             137rdh 
                                                09.09.2020 02:46
                                                
                                                137rdh 
                                                09.09.2020 02:46
                                             iraermila 
                                                09.09.2020 01:56
                                                
                                                iraermila 
                                                09.09.2020 01:56
                                            
procedure TForm1.Button1Click(Sender: TObject);
var i,s:integer;
begin
S := 0;
for i := 20 to 30 do
S := S + i;
Label1.Caption := IntToStr(S);
end;