344A - Magnets.

#include<bits/stdc++.h>

using namespace std;

int main()

{

    int n;

    cin>>n;

    int a;

    cin>>a;

    int count=1;

    for(int i=0; i<n-1; i++)

    {

        int b;

        cin>>b;

        if(a!=b)

        {

            count++;

            a=b;

        }

    }

    cout<<count<<endl;

}