//A lvl
var
i,sum: integer;
begin
i := 20; sum:=0;
while (i < 100) do
begin
inc(sum,i);
inc(i);
end;
Writeln(sum);
end.
// B lvl
var
i: integer;
sum:real;
begin
i := 1; sum:=0;
while (i <= 10) do<br> begin
sum := sum + 1 / i;
inc(i);
Writeln(sum);
end;
Writeln(sum);
end.