N = gets.to_i
A = gets.split.map(&:to_i)

dp = Array.new(N + 1) { Array.new(2) { [-1, -Float::INFINITY] } }
dp[0][0][0] = 0

N.times do |i|
  a = A[i]

  if dp[i][1][1] == a
    if dp[i + 1][1][0] <= dp[i][0][0]
      dp[i + 1][1] = [dp[i][0][0] + 1, a]
    end

    if dp[i + 1][1][0] <= dp[i][1][0]
      dp[i + 1][1] = [dp[i][1][0] + 1, a]
    end
  else
    if dp[i + 1][1][0] <= dp[i][0][0]
      dp[i + 1][1] = [dp[i][0][0] + 1, a]
    end

    if dp[i + 1][1][0] <= dp[i][1][0]
      dp[i + 1][1] = [dp[i][1][0], [dp[i][1][1], a].max]
    end
  end

  if dp[i + 1][0][0] <= dp[i][0][0]
    dp[i + 1][0] = [dp[i][0][0], -Float::INFINITY]
  end

  if dp[i + 1][0][0] <= dp[i][1][0]
    dp[i + 1][0] = [dp[i][1][0], -Float::INFINITY]
  end
end

puts [dp[N][0][0], dp[N][1][0]].max