344A.Magnets.cpp

#include <bits/stdc++.h>

using namespace std;

// Ashfak Hossain Evan, CSE, American International University-Bangladesh (AIUB)

int main()
{

    ios_base::sync_with_stdio(false);
    cin.tie(NULL), cout.tie(NULL);

    // Code Start From Here

    int n, c = 0;
    cin >> n;

    int arr[100000];

    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
    }

    for (int i = 0; i < n; i++)
    {
        if (arr[i] != arr[i + 1])
            c++;
        }
    cout << c << endl;

    return 0;
}