#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) cin >> a.at(i);
    int taken = 1, nottaken = 0;
    for (int i = 1; i < n; i++) {
        int taken_new, nottaken_new = taken;
        if (a.at(i) == a.at(i - 1)) {
            taken_new = max(taken + 1, nottaken + 1);
        } else {
            taken_new = nottaken + 1;
        }
        taken = taken_new;
        nottaken = nottaken_new;
    }
    cout << max(taken, nottaken) << endl;
}