How to write a if-controller condition for jmeter

I have a situation where in the web app asks for security question开发者_C百科 the first time the user logs in, after which subsequent accesses mfa(security qns) are not asked. I added a if-controller but not sure what condition to write in it? Any suggestions?

"${chargeback}" != "4"

here chargeback is variable based on the value of which if controller will decide the flow

Seem to me that you could use a "Once Only Controller" instead of a "if controller".

For more info check here at the jakarta jmeter site.