#include <bits/stdc++.h>
using namespace std;
#define Yalahwy cin.tie(0), cout.tie(0), cin.sync_with_stdio(0), cout.sync_with_stdio(0);
#define ll long long
#define ld long double
#define EPS 1e-9
#define INF INT_MAX
#define pb push_back
#define pf push_front
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define allr(x) x.rbegin(),x.rend()
#define rep(i, k, n) for(int i=k; i < n ; i++)
#define rev(i, n, k) for(int i = n; i>= k; i--)
#define yes cout << "YES" << endl;
#define no cout << "NO" << endl;
#define NIL -1

// alt + ctrl + l
// يا رب
const ll MOD = 1000000007;
const ll N = 100;
const ll C = 10;
//const ll K = 5;
const ll M = 10;
//const int OO=0x3f3f3f3f;
//const ll LOO=0x3f3f3f3f3f3f3f3f;
//int dx8[] = {+0, +0, -1, +1, +1, +1, -1, -1};
//int dy8[] = {-1, +1, +0, +0, +1, -1, +1, -1};
//int dx4[] = {+0, +0, -1, +1};
//int dy4[] = {-1, +1, +0, +0};
//struct cmp {
//    bool operator()(M const& p1, M const& p2)
//    {
//        return p1.dis > p2.dis;
//    }
//};

int main() {
    Yalahwy
    ll T = 1;
//    cin >> T;
    while (T--){
        ll n, ans = 0;
        cin >> n;
        set<ll> s;
        for (int i = 0; i < n; ++i) {
            ll x;
            cin >> x;
            s.insert(x);
            if(s.size() > 1){
                ans++;
                s.clear();
            }
        }
        cout << ans << endl;
    }
}