[R] vector subtraction

[uday]

I would like to calculate vector from existing  value 
e.g 
v       <- 1000 
s       <- 30 
d1    <- v-s 
                   d1    <- 970 
d2    <- d1 -s
                   d2    <- 940  
d 3   <- d2-s 
                   d3    <- 910 
:
:
d15   <- .....

so how I should get vector of length 15         d < -  970,940 , 910 ,
....... 

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