The input is the small graph displayed to the left. The result of the query will be the sum of all node labels of this graph. To calculate this, a `GetGraphElements_Box(Nodes)`

is used to filter all nodes from the input graph elements. The output of this box is shown as a pile of nodes. Those nodes are the input of the next box, a `GetAttributeValue_Box(label)`

that retrieves the label from those nodes. The result is a list of six numbers. Pushing this list into the `Arithmetic_Box(sum)`

yields the desired result as output.

This is a very simple and straightforward way of calculating the node label sum since it exactly follows the intuitive way of getting this result.