// Slower C++ solution:
#include <bits/stdc++.h>



//{ START

using namespace std;

#define int int64_t

#define rep(i, a, n) for (int i = (a); i < (n); ++i)

#define reps(i, a, n) for (int i = (n - 1); i > (a - 1); --i)

#define arep(i, x) for (auto &&i : (x))

#define irep(i, x) for (auto i = (x).begin(); i != (x).end(); ++i)

#define rirep(i, x) for (auto i = (x).rbegin(); i != (x).rend(); ++i)

//降順はgreater<T>()

#define all(x) (x).begin(), (x).end()

#define rv(s) reverse((s).begin(), (s).end())

// gcd lcmはそのままok

#define gcd(a, b) __gcd(a, b)

#define bits(n) (1LL << (n))

#define pcnt(x) __builtin_popcountll(x)

//配列内等要素削除

#define Unique(x) (x).erase(unique((x).begin(), (x).end()), (x).end())

#define Fixed(n) fixed << setprecision(n)

//総和

#define sowa(n) (((n) * ((n) + 1)) / 2)

#define updiv(a, b) ((a + b - 1) / b)

#define cauto const auto &

using P = pair<int, int>;

using Graph = vector<vector<P>>;

template <class T>  //昇順

using min_heap = priority_queue<T, vector<T>, greater<T>>;

template <class T>  //降順

using max_heap = priority_queue<T>;

template <class A, class B>

using umap = unordered_map<A, B>;

template <class A>

using uset = unordered_set<A>;

template <typename A, size_t N, typename T>

void Fill(A (&array)[N], const T &val) {  //多次元初期化

  std::fill((T *)array, (T *)(array + N), val);

}

template <class A, class B>

bool chmax(A &a, const B &b) {  //最大値更新 返り値はbool

  if (a < b) {

    a = b;

    return 1;

  }

  return 0;

}

template <class A, class B>

bool chmin(A &a, const B &b) {  //最小値更新 返り値はbool

  if (b < a) {

    a = b;

    return 1;

  }

  return 0;

}

int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};

int dy[] = {0, 1, 0, -1, 1, 1, 1, -1, -1};

constexpr int INF = 0x3f3f3f3f;

constexpr int LINF = 0x3f3f3f3f3f3f3f3fLL;

constexpr int mod1 = 1e9 + 7;

constexpr int mod2 = 998244353;

//} END



signed main(void) {

  cin.tie(nullptr);

  ios_base::sync_with_stdio(false);



  int h, w, m;

  cin >> h >> w >> m;

  set<P> se;

  int mx = 0, my = 0;

  vector<int> x(400000, 0), y(400000, 0);

  vector<int> nx, ny;

  rep(i, 0, m) {

    int X, Y;

    cin >> X >> Y;

    --X, --Y;

    se.insert(make_pair(X, Y));

    ++x[X];

    ++y[Y];

    chmax(mx, x[X]);

    chmax(my, y[Y]);

  }

  bool jud = false;

  rep(i, 0, h) if (x[i] == mx) nx.emplace_back(i);

  rep(i, 0, w) if (y[i] == my) ny.emplace_back(i);

  rep(i, 0, nx.size()) {

    rep(j, 0, ny.size()) {

      if (se.find(make_pair(nx[i], ny[j])) == se.end()) {

        cout << mx + my << '\n';

        return 0;

      }

    }

  }

  cout << mx + my - 1 << '\n';

  return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.2879027266324397x):
#include <bits/stdc++.h>



//{ START

using namespace std;

#define int int64_t

#define rep(i, a, n) for (int i = (a); i < (n); ++i)

#define reps(i, a, n) for (int i = (n - 1); i > (a - 1); --i)

#define arep(i, x) for (auto && (i) : (x))

#define irep(i, x) for (auto i = (x).begin(); i != (x).end(); ++i)

#define rirep(i, x) for (auto i = (x).rbegin(); i != (x).rend(); ++i)

//降順はgreater<T>()

#define all(x) (x).begin(), (x).end()

#define rv(s) reverse((s).begin(), (s).end())

// gcd lcmはそのままok

#define gcd(a, b) __gcd(a, b)

#define bits(n) (1LL << (n))

#define pcnt(x) __builtin_popcountll(x)

//配列内等要素削除

#define Unique(x) (x).erase(unique((x).begin(), (x).end()), (x).end())

#define Fixed(n) fixed << setprecision(n)

//総和

#define sowa(n) (((n) * ((n) + 1)) / 2)

#define updiv(a, b) ((a + b - 1) / b)

#define cauto const auto &

using P = pair<int, int>;

using Graph = vector<vector<P>>;

template <class T>  //昇順

using min_heap = priority_queue<T, vector<T>, greater<T>>;

template <class T>  //降順

using max_heap = priority_queue<T>;

template <class A, class B>

using umap = unordered_map<A, B>;

template <class A>

using uset = unordered_set<A>;

template <typename A, size_t N, typename T>

void Fill(A (&array)[N], const T &val) {  //多次元初期化

  std::fill((T *)array, (T *)(array + N), val);

}

template <class A, class B>

bool chmax(A &a, const B &b) {  //最大値更新 返り値はbool

  if (a < b) {

    a = b;

    return 1;

  }

  return 0;

}

template <class A, class B>

bool chmin(A &a, const B &b) {  //最小値更新 返り値はbool

  if (b < a) {

    a = b;

    return 1;

  }

  return 0;

}

int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};

int dy[] = {0, 1, 0, -1, 1, 1, 1, -1, -1};

constexpr int INF = 0x3f3f3f3f;

constexpr int LINF = 0x3f3f3f3f3f3f3f3fLL;

constexpr int mod1 = 1e9 + 7;

constexpr int mod2 = 998244353;

//} END



signed main(void) {

  cin.tie(nullptr);

  ios_base::sync_with_stdio(false);



  int h, w, m;

  cin >> h >> w >> m;

  int mx = 0, my = 0;

  vector<int> x(300010), y(300010);

  set<P> se;

  rep(i, 0, m) {

    int nx, ny;

    cin >> nx >> ny;

    --nx, --ny;

    ++x[nx];

    ++y[ny];

    chmax(mx, x[nx]);

    chmax(my, y[ny]);

    se.insert({nx, ny});

  }

  vector<int> sx, sy;

  rep(i, 0, h) if (mx == x[i]) sx.emplace_back(i);

  rep(i, 0, w) if (my == y[i]) sy.emplace_back(i);

  bool jud = false;

  int ans = mx + my;

  arep(i, sx) arep(j, sy) if (se.find({i, j}) == se.end()) {

    jud = true;

    goto out;

  }

out:

  cout << (jud ? ans : ans - 1) << '\n';

  return 0;

}