There is an "if" in the programming menu that almost certainly won't work in express.
There is also an If function, very similar to the one in EXCEL: if(test, return if true, return if false)
That one might squeak past.
It means everything shown in the "programming" menu:
As noted by others, there is a seperate "if" function that is available in Express (under "functions", not "Math->Programming").