#define MOD_TYPE 1

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

#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using Int = boost::multiprecision::cpp_int;
using lld = boost::multiprecision::cpp_dec_float_100;

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;
template <typename Q_type>
using smaller_queue = priority_queue<Q_type, vector<Q_type>, greater<Q_type>>;

constexpr ll MOD = (MOD_TYPE == 1 ? (ll)(1e9 + 7) : 998244353);
//constexpr ll MOD = 1;
constexpr int INF = (int)1e9 + 10;
constexpr ll LINF = (ll)4e18;
constexpr double PI = acos(-1.0);
constexpr double EPS = 1e-11;
constexpr int Dx[] = {0, 0, -1, 1, -1, 1, -1, 1, 0};
constexpr int Dy[] = {1, -1, 0, 0, -1, -1, 1, 1, 0};

#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define REPI(i, m, n) for (int i = m; i < (int)(n); ++i)
#define repi(i, n) REPI(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << "\n"
#define Yes(n) cout << ((n) ? "Yes" : "No") << "\n"
#define possible(n) cout << ((n) ? "possible" : "impossible") << "\n"
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << "\n"
#define Yay(n) cout << ((n) ? "Yay!" : ":(") << "\n"
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << "\n";

inline void init_main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << setprecision(30) << setiosflags(ios::fixed);
}
template <typename T>
inline bool chmin(T &a, T b)
{
  if (a > b)
  {
    a = b;
    return true;
  }
  return false;
}
template <typename T>
inline bool chmax(T &a, T b)
{
  if (a < b)
  {
    a = b;
    return true;
  }
  return false;
}
inline ll CEIL(ll a, ll b)
{
  return (a + b - 1) / b;
}
template <typename A, size_t N, typename T>
inline void Fill(A (&array)[N], const T &val)
{
  fill((T *)array, (T *)(array + N), val);
}
template <typename T, typename U>
constexpr istream &operator>>(istream &is, pair<T, U> &p) noexcept
{
  is >> p.first >> p.second;
  return is;
}
template <typename T, typename U>
constexpr ostream &operator<<(ostream &os, pair<T, U> &p) noexcept
{
  os << p.first << " " << p.second;
  return os;
}
#pragma endregion

template <typename T>
class SegmentTree
{
private:
  using Fn = function<T(T, T)>;
  int N;
  vector<T> dat;
  T unit;
  Fn func;

public:
  SegmentTree() {}
  SegmentTree(int n_, Fn func_, T unit_) : func(func_), unit(unit_)
  {
    N = 1;
    while (N < n_)
      N *= 2;
    dat.assign(2 * N - 1, unit);
  }
  SegmentTree(const vector<T> &v, Fn func_, T unit_) : func(func_), unit(unit_)
  {
    N = 1;
    int sz = v.size();
    while (N < sz)
      N *= 2;
    dat.resize(2 * N - 1);
    for (int i = 0; i < N; ++i)
      dat[i + N - 1] = (i < sz ? v[i] : unit);
    for (int i = N - 2; i >= 0; --i)
      dat[i] = func(dat[i * 2 + 1], dat[i * 2 + 2]);
  }

  void update(int k, T a)
  {
    k += N - 1;
    dat[k] = a;
    while (k > 0)
    {
      k = (k - 1) / 2;
      dat[k] = func(dat[k * 2 + 1], dat[k * 2 + 2]);
    }
  }

  T get(int k) { return dat[k + N - 1]; }

  T query(int l, int r)
  {
    T vl = unit, vr = unit;
    for (l += (N - 1), r += (N - 1); l < r; l >>= 1, r >>= 1)
    {
      if ((l & 1) == 0)
        vl = func(vl, dat[l]);
      if ((r & 1) == 0)
        vr = func(vr, dat[--r]);
    }
    return func(vl, vr);
  }
};

void solve()
{
  int h, w, m;
  cin >> h >> w >> m;
  vector<int> v[300010];
  auto my_max = [](int a, int b) { return max(a, b); };
  SegmentTree<int> sg(300010, my_max, 0);
  rep(i, m)
  {
    int hi, wi;
    cin >> hi >> wi;
    hi--, wi--;
    v[hi].push_back(wi);
    sg.update(wi, sg.get(wi) + 1);
  }
  int Max = 0;
  rep(hi, 300010)
  {
    int cnt = v[hi].size();
    for (auto wi : v[hi])
      sg.update(wi, sg.get(wi) - 1);
    cnt += sg.query(0, 300010);
    chmax(Max, cnt);
    for (auto wi : v[hi])
      sg.update(wi, sg.get(wi) + 1);
  }
  cout << Max << "\n";
}

int main()
{
  init_main();
  solve();
}


Measured memory_bytes: 23796