Boxplot for each individual level in two factor columns?

This is my code. I have two factor variables ( cyl and am )that I want to plot in my box plot.

boxplot(mpg~cyl+am,data=mtcars)

I want to make a boxplot for each individual factor levels - 4,6,8,0,1 but not the interaction of them (eg 4.0).

My box plot should only have (4,6,8,0,1) on the axis. How do I do that?

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You may reshape the data and then you can do the plotting, However this may not be the elegant

library(reshape2)
mtcars_subset <- mtcars[,c("am", "cyl", "mpg")]
dat <- melt(mtcars_subset, id.vars="mpg")
#or dat <- melt(mtcars, id.vars = "mpg", measure.vars = c("cyl", "am"))
boxplot(data=dat, mpg ~ value)

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