#include<bits/stdc++.h>
using namespace std;
#define rep(i,x,y) for(int i=x;i<y;i++)
#define range(a) (a).begin(),(a).end()
#define print(A,n) rep(i,0,n){cout<<(i ? " ":"")<<A[i];}cout<<endl;
#define pprint(A,m,n) rep(j,0,m){print(A[j],n);}
const long mod=1e9+7;
const int size=1e3;
const int inf=1e9;
int main(){
 int N;cin>>N;
 int A[N];
 int temp=-2;int cnt=0;
 rep(i,0,N){
   cin>>A[i];
   if(temp==i-1){
     if(A[i-1]==A[i]){ temp=i;cnt++; }
   }else{
     temp=i; cnt++;
   }
 }cout<<cnt<<endl;
}