[R] Create NA

[tj]

Hi,

How can I create an NA?
for example, i have this program but it has errors

> x=scan()
1: 1 2 3 4 5
6: 
Read 5 items
> "na"*x
Error in "na" * x : non-numeric argument to binary operator


what should I multiply x so that I will get an NA? And I really need to
multiply that with my x vector. 
I need this output: (na,na,na,na,na)

Thank you for your time and help!=)
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