Extract a value from a string file and converting it to int with Java

I have a text file (test.txt) :

Bob, 12, 15, 20
Ruth, 45, 212, 452

With Java, I want to extract only the last element of each line (each element being separated by a coma).

For now on, I wrote this code :

br = new BufferedReader(new FileReader("test.txt"));
while ((line = br.readLine()) != null) {

    String[] facture = line.split(",");
    
    int fquantite = Integer.parseInt(facture[3]);

System.out.println("Amount=" + fquantite);

But it gives me an error. The thing is that I get how to get the number (for exemple, I can write : System.out.println("Amount=" + facture[3]);

And it works, but for some reason, I can't get to convert it to a int. The reason I want to do that is because when I'll have this int variable, I'll want to add it to another int variable.