[R] Lag vector of dates by vector of days

[RNoob]

Dear All,

I am looking for a function to get lagged dates from an input vector of
dates, whereas the lag is specified by another vector. Each date is lagged
by a different number of days. (specified in vector n)

Example: 

input <-  as.Date( c( "2002-01-30", "2002-02-24", "2002-03-31") )

n         <-  c(10, 20, 31)                
  
Desired Result:

"2002-02-09"
"2002-03-16"
"2002-05-01"

Can anyone help me with this?

Thanks in advance,

RNoob
    

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