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

//template
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(a);i>(b);i--)
#define ALL(v) (v).begin(),(v).end()
typedef long long int ll; const int inf = 0x3fffffff; const ll INF = 0x3fffffffffffffff;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
//template end



int main(){
    int n; scanf("%d",&n);
    vector<int> a(n); int ans=0;
    rep(i,0,n)scanf("%d",&a[i]);
    bool f=0; int pre=-1;
    rep(i,0,n){
        if(f){
            if(pre==a[i])f=1;
            else f=0;
        }
        else f=1;
        if(f)ans++,pre=a[i];
    }
    printf("%d\n",ans);
    return 0;
}