#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

#define rep(i, n) for (int i = 0; i < (n); i += 1)
#define len(a) ((int)(a).size())
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()

mt19937 rnd(324);
const ll inf = 1e18;

int32_t main() {
    if (1) {
        ios::sync_with_stdio(0);
        cin.tie(0);
        cout.tie(0);
    }

    int t;
    cin >> t;

    while (t--) {
        int n;
        cin >> n;
        vector<pair<int, int>> vec(n);
        for (auto &c : vec)
            cin >> c.first >> c.second;

        int ans = n;
        for (int i = 0; i + 1 < n; ++i) {
            ans -= (vec[i].first == vec[i + 1].first && vec[i].second == vec[i + 1].second);
        }

        cout << ans << "\n";
    }

    return 0;
}