import sequtils,strutils
var
  N = stdin.readline.parseInt
  A = stdin.readline.split.map(parseInt)
  cnt = 0
  f = false
for i, a in A:
  if f == false:
    f = true
    cnt += 1
  elif i > 0 and A[i - 1] == a:
    f = true
    cnt += 1
  else:
    f = false
echo cnt