Capture Response id from "PUT" REST API

Hi @Brian_Ducson , would you know how to skip two levels of dynamic values?
I need to retrieve the 3rd level value by ignoring the parent level (which is always dynamic) and the 2nd level which is unfortunately, also dynamic. Response body below:

{
1”:[
{
8”:{
“totalExecutions”:0,
}

From above, I need to skip “1” and “8” (both will dynamically change) before retrieving the value “0” of totalExecutions. I tried following the nested loop statement from here (putting another loop statement within the loop:
http://forum.katalon.com/t/how-to-get-json-value-skip-first-level/10857/6

but I get the error below:
com.kms.katalon.core.exception.StepErrorException: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object ‘1=[{8={totalExecutions=0}]’ with class ‘java.util.TreeMap$Entry’ to class ‘java.util.Map’