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procedure renko();
var cnt2,zw,zahl,cnt,value,i,range,plus,k: integer;
arr: array of array of integer;
begin
i:= 1;
k:= form4.listbox1.items.count;
Setlength(arr, k, k);
Value := strtoint(trim(form4.listbox1.items[i]));
    while i < k do
        begin
              if strtoint(form4.listbox1.items[i]) > Value then
                begin
                  range:= strtoint(trim(form4.listbox1.items[i]))- value;
                  cnt:= range div 15;
                  plus:= range mod 15;
                  form4.ListBox1.Items[i]:= inttostr(strtoint(trim(form4.listbox1.Items[i])) + plus);
                  value:= strtoint(trim(form4.listbox1.items[i]));
                  Form4.ListBox1.Items[i]:= inttostr(0);
                  zahl:= 0;
                  arr[i][zahl]:= cnt;
                  arr[i][1]:= 0;
                  inc(i);
                end
              else
                begin
                  range:= value - strtoint(trim(form4.listbox1.items[i]));
                  cnt:= range div 15;
                  plus:= range mod 15;
                  form4.ListBox1.Items[i]:= inttostr(strtoint(trim(form4.listbox1.Items[i])) + plus);
                  value:= strtoint(trim(form4.listbox1.items[i]));
                  form4.ListBox1.items[i]:= inttostr(1);
                  zahl:= 1;
                  arr[i][zahl]:= cnt;
                  arr[i][0]:= 0;
                  inc(i);
                end;
        end;
      For i:=form4.ListBox1.Items.count downto 0 do
          begin
            <span style="color: red">cnt2:= arr[i][1];</span>
              if cnt2 > 0 then
                begin
                  dec(cnt);
                  form4.listbox1.Items.insert(i,inttostr(1));
                end;
          end;

     For i:=form4.ListBox1.Items.count downto 0 do
          begin
            cnt2:= arr[i][0];
              if cnt2 > 0 then
                begin
                  dec(cnt);
                  form4.listbox1.Items.insert(i,inttostr(0));
                end;

          end;
end;                    

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  k:= form4.listbox1.items.count;
  Setlength(arr, k, k); 
[...]
For i:= (form4.ListBox1.Items.count - 1) downto 0 do
  begin
     [...]