> For the complete documentation index, see [llms.txt](https://help.uchat.com.au/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.uchat.com.au/set-variable-value-is-not-working.md).
# Set Variable Value is Not Working
The set variable “***input value***” feature does not support math operation. Let's say the user need to calculate "number + 1",
So if the user wants to perform a calculation of “***number +1***” the correct feature to use is “***math: add (+)***”. Please refer to the image below;
Also, if you want to perform a higher number of calculations then we would suggest to use “***JavaScript Function***”.
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