#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double

#define pii pair<int, int>

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
#ifdef CB
	freopen("be2.txt", "r", stdin);
//	freopen("out.txt", "w", stdout);
#endif
	int N, M, K;
	cin >> N >> M >> K;
	vector<pii> v(K);
	for (int i = 0; i < K; i++) {
		cin >> v[i].first >> v[i].second;
	}
	sort(v.begin(), v.end());
	vector<int> s;
	for (int i = 0; i < K; i++) {
		auto t = lower_bound(s.begin(), s.end(), -v[i].second);
		if (t == s.end()) {
			s.push_back(-v[i].second);
		}
		else {
			*t = -v[i].second;
		}
	}
	cout << s.size() << '\n';
	return 0;
}