#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; }