Accessing the Contents of an R Language Object

Please tell me how to access the contents of the object.
Specifically...

sex<-c("F", "M", "M", "M", "F")
number<-c (1, 2, 3, 4, 5)
x<-data.frame (SEX=sex, NUMBER=number)

y<-c (1, 2, 4)

At times like this...

c<-subset(x,NUMBER!=y)

I want to do it like above, but it doesn't work
In other words, I would like to leave only 3,5 of NUMBER in the end.

It's hard to understand how to ask questions, but I appreciate your cooperation.