#include <bits/stdc++.h>
#define ll long long
#define R return
#define pb push_back
#define F first
#define S second
#define B break
#define C continue
#define SI size()
using namespace std;
ll n,a[100005];
int main()
{
    ll n;
    cin>>n;
    ll x=0,y=1;
    for(ll i=0;i<n;i++){
        cin>>a[i];
        if(y!=1){
            if(a[i]!=a[i-1]){
                x++;
                y=1;
            }
        }
        else y=0;
    }
    cout<<x;
    return 0;
}