#include "bits/stdc++.h"
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;

typedef long long ll;

int main() {
    int N, A, B = 0, ans = 0, j = -2;
    cin >> N;
    rep(i, N) {
        cin >> A;
        if (j + 1 < i || B == A) {
            ans++;
            j = i;
        }
        B = A;
    }
    cout << ans << endl;
}