#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<vector<int>> dp(n, vector<int>(2));
  dp[0][1] = 1;
  for (int i = 1; i < n; i++) {
    dp[i][0] = max(dp[i - 1][1], dp[i - 1][0]);
    dp[i][1] = max(dp[i - 1][1] + (int) (a[i] == a[i - 1]), dp[i - 1][0] + 1);
  }
  cout << max(dp[n - 1][0], dp[n - 1][1]) << '\n';
  return 0;
}