#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;

int main() {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  int n; cin >> n;
  V<> a(n); for (auto&& e : a) cin >> e;
  V<> dp(2);
  dp[1] = 1;
  for (int i = 1; i < n; ++i) {
    V<> ndp(2);
    ndp[0] = max(dp[0], dp[1]);
    if (a[i - 1] == a[i]) {
      ndp[1] = dp[1] + 1;
    } else {
      ndp[1] = dp[0] + 1;
    }
    swap(dp, ndp);
  }
  cout << max(dp[0], dp[1]) << '\n';
}