#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vs = vector<string>;
using pll = pair<ll, ll>;
using vp = vector<pll>;
#define rep(i, n) for(ll i = 0; i < (n); i++)
#define repb(i, n) for(ll i = (n)-1; i >= 0; i--)
#define repr(i, a, b) for(ll i = (a); i < (b); i++)
#define reprb(i, a, b) for(ll i = (b)-1; i >= (a); i--)
#define ALL(a) (a).begin(), (a).end()
#define SZ(x) ((ll)(x).size())
const ll MOD = 1000000007;
const ll INF = 100000000000000000LL;
const ld EPS = 1e-12L;
const ld PI = 3.1415926535897932385L;
inline ll GCD(ll a, ll b){ return b?GCD(b, a % b):a; }
inline ll LCM(ll a, ll b){ return a/GCD(a, b)*b; }
inline ll powint(ull x, ll y){ ll r=1; while(y){ if(y&1) r*=x; x*=x; y>>=1; } return r; }
inline ll powmod(ll x, ll y, ll m = MOD){ ll r=1; while(y){ if(y&1) r*=x; x*=x; r%=m; x%=m; y>>=1; } return r; }
template<class S, class T>inline bool chmax(S &a, const T &b){ if(a<b) { a=b; return 1; } return 0; }
template<class S, class T>inline bool chmin(S &a, const T &b){ if(b<a) { a=b; return 1; } return 0; }
#ifdef OJ_LOCAL
#include "dump.hpp"
#else
#define dump(...) ((void)0)
#endif

const int MAX = 100010;
int dp[MAX][2];

int main(){
    cin.tie(0); ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    ll n;
    cin >> n;
    vll a(n);
    rep(i, n){
        cin >> a[i];
    }
    dp[0][0] = 1;
    dp[0][1] = 0;
    repr(i, 1, n){
        if(a[i] == a[i-1]){
            dp[i][0] = max(dp[i-1][0], dp[i-1][1]) + 1;
            dp[i][1] = max(dp[i-1][0], dp[i-1][1]);
        }else{
            dp[i][0] = dp[i-1][1] + 1;
            dp[i][1] = max(dp[i-1][0], dp[i-1][1]);
        }
    }
    cout << max(dp[n-1][0], dp[n-1][1]) << endl;
    return 0;
}