#pragma region template
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vld = vector<ld>;
using vvld = vector<vld>;
using vvvld = vector<vvld>;
using vs = vector<string>;
using pll = pair<ll, ll>;
using vp = vector<pll>;
template <typename T>
using pqrev = priority_queue<T, vector<T>, greater<T>>;
#define rep(i, n) for (ll i = 0, i##_end = (n); i < i##_end; i++)
#define repb(i, n) for (ll i = (n)-1; i >= 0; i--)
#define repr(i, a, b) for (ll i = (a), i##_end = (b); i < i##_end; i++)
#define reprb(i, a, b) for (ll i = (b)-1, i##_end = (a); i >= i##_end; i--)
#define ALL(a) (a).begin(), (a).end()
#define SZ(x) ((ll)(x).size())
//*
constexpr ll MOD = 1e9 + 7;
/*/
constexpr ll MOD = 998244353;
//*/
constexpr ll INF = 1e+18;
constexpr ld EPS = 1e-12L;
constexpr ld PI = 3.14159265358979323846L;
constexpr ll GCD(ll a, ll b) { return b ? GCD(b, a % b) : a; }
constexpr ll LCM(ll a, ll b) { return a / GCD(a, b) * b; }
template <typename S, typename T>
inline bool chmax(S &a, const T &b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <typename S, typename T>
inline bool chmin(S &a, const T &b) {
  if (b < a) {
    a = b;
    return 1;
  }
  return 0;
}
#ifdef OJ_LOCAL
#include "dump.hpp"
#else
#define dump(...) ((void)0)
#endif
template <typename T>
bool print_(const T &a) {
  cout << a;
  return true;
}
template <typename T>
bool print_(const vector<T> &vec) {
  for (auto &a : vec) {
    cout << a;
    if (&a != &vec.back()) {
      cout << " ";
    }
  }
  return false;
}
template <typename T>
bool print_(const vector<vector<T>> &vv) {
  for (auto &v : vv) {
    for (auto &a : v) {
      cout << a;
      if (&a != &v.back()) {
        cout << " ";
      }
    }
    if (&v != &vv.back()) {
      cout << "\n";
    }
  }
  return false;
}
void print() { cout << "\n"; }
template <typename Head, typename... Tail>
void print(Head &&head, Tail &&... tail) {
  bool f = print_(head);
  if (sizeof...(tail) != 0) {
    cout << (f ? " " : "\n");
  }
  print(forward<Tail>(tail)...);
}
#pragma endregion

set<pll> st;

// v1をソートし、v2を対応する位置に移動する
template <typename T, typename U>
void pairSort(vector<T> &v1, vector<U> &v2, bool rev = false) {
  int n = v1.size();
  vector<pair<T, U>> p(n);
  for (int i = 0; i < n; i++) {
    p[i] = pair<T, U>(v1[i], v2[i]);
  }
  if (rev) {
    sort(p.begin(), p.end(), [&](const auto &l, const auto &r) {
      if (l.first == r.first)
        return l.second > r.second;
      else
        return l.first < r.first;
    });
  } else {
    sort(p.begin(), p.end());
  }
  for (int i = 0; i < n; i++) {
    v1[i] = p[i].first;
    v2[i] = p[i].second;
  }
}


int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(20);
  ll H, W, M;
  cin >> H >> W >> M;
  vll cnth(H, 0), cntw(W, 0);
  vll h(M), w(M);
  rep(i, M){
    cin >> h[i] >> w[i];
    h[i]--; w[i]--;
    st.emplace(h[i], w[i]);
    cnth[h[i]]++;
    cntw[w[i]]++;
  }
  
  vll idxh(H);
  iota(ALL(idxh), 0ll);
  vll idxw(W);
  iota(ALL(idxw), 0ll);
  pairSort(cnth, idxh);
  pairSort(cntw, idxw);
  reverse(ALL(cnth));
  reverse(ALL(idxh));
  reverse(ALL(cntw));
  reverse(ALL(idxw));
  rep(i, H){
    if(cnth[i] < cnth[0]) break;
    rep(j, W){
      if(cntw[j] < cntw[0]) break;
      if(!st.count({idxh[i], idxw[j]})){
        dump(idxh[i], idxw[j]);
        print(cnth[0]+cntw[0]);
        return 0;
      }
    }
  }
  print(cnth[0]+cntw[0]-1);
}


Measured memory_bytes: 40672