$bighash{$key1}{$key2}{$key3}{$key4}[$topic-1][$index-1] = $total;

##</code><code>##

$VAR1 = {'50' -> {
..........'20' -> {
.............'6' -> {
...............'4' -> |
...................|
....................'30',
....................'40',
....................'20',
....................'20',
....................'10'
....................|,

....................|

....................'28',
....................'10',
....................'76',
....................'20',
....................'10'
....................|,

........{'60' => {
..........'30' => {
............'6' => {
...............'4' => |

                       |

....................'30',

##</code><code>##

$VAR1 = {'50' => {
...........'20' => {
............'6' => {
.............'4' => |

.....................|

....................'40',=>index2
....................'30',=>index1
....................'20',=>index3
....................'20',=>index4
....................'10'=>index5
.....................|,