Counting Nodes?

I want to ask which nodes is used to count the total number of molecules after filtering. I used Value Counter, it works out fine when we can specify the criterias, however, I was not able to count just the total number of molecules remained after going through the workflow.

Thank you.

The GroupBY node is best for this.

In the aggregation tab, simply select the structure column, and for aggregation type choose "Count". If the structures are as Smiles, then you can also choose "Unique Count" which will tell you how many different structures you have (i.e. duplicates removed).