Varying the number of iterations in a for loop depending on results in the body of the for loop in R

Here is the code that I tried, to vary my iterations in a for loop

repscount <- value
for (i in 1:repscount) { 
  ##certain calculations on x
  if (x == 0) {repscount <- repscount + 1} else{}##add x to a list
}

But my repscount does not increase. Does is rewrite the value of repscount? Is there another way of doing this without using a while loop?