var k,x,m:integer;
begin
x:=IntToStr(Edit1.Text);
m:=x;
if (x>99) and (x<1000) then
begin
k:=0;
while m<>0 do
begin
k:=k+(m mod 10);
m:=m div 10;
end;
Label1.Caption:=StrToInt(k);
end
else
Memo1.Lines:='Error!';
end.