[R] How to count the number of occurence?

[tj]

Hi, may I ask for your help...
What is the R code if I want to count the number of times that "2" appeared
in the following R output

> k
 [1] 1 1 1 1 1 1 3 1 2 1 1 1 1 1 1 1 1 3 2 1 1 4 1 1 1 1 1 5 1 1




Thank you for your help. :-)
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