[R] add values inside vector

[Grześ]

I think it's easy problem but I can't find solution.

I have a vector:

vec <- c (23.4, 3.0, 14.7, 7.7)

and I would like to add all values which are inside my vector to  each
other.

as a result a want to get one value  like sum all values from my vector- 
sth=(23.4 + 3.0 + 14.7 + 7.7) 

PS. I usually don't know how long is my vector in my function  
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