#include <bits/stdc++.h>

template <typename T, typename = void>
struct is_iterable : std::false_type {};
template <typename T>
struct is_iterable<T, std::void_t<decltype(std::begin(std::declval<T>())),
                                  decltype(std::end(std::declval<T>()))>>
    : std::true_type {};

template <typename T, typename = void>
struct is_pair : std::false_type {};
template <typename T>
struct is_pair<T, std::void_t<decltype(std::declval<T>().first),
                              decltype(std::declval<T>().second)>>
    : std::true_type {};

template <typename T>
void debug(const T& v) {
  if constexpr (is_pair<T>::value) {
    std::cerr << "{";
    debug(v.first);
    std::cerr << ", ";
    debug(v.second);
    std::cerr << "}";
  } else if constexpr (is_iterable<T>::value &&
                       !std::is_same<T, std::string>::value) {
    std::cerr << "{";
    for (auto it = v.begin(); it != v.end(); ++it) {
      if (it != v.begin()) std::cerr << ", ";
      debug(*it);
    }
    std::cerr << "}";
  } else {
    std::cerr << v;
  }
}
template <typename T, typename... Ts>
void debug(const T& value, const Ts&... args) {
  debug(value);
  std::cerr << ", ";
  debug(args...);
}
#if DEBUG
#define dbg(...)                        \
  do {                                  \
    cerr << #__VA_ARGS__ << ": ";       \
    debug(__VA_ARGS__);                 \
    cerr << " (L" << __LINE__ << ")\n"; \
  } while (0)
#else
#define dbg(...)
#endif

void read_from_cin() {}
template <typename T, typename... Ts>
void read_from_cin(T& value, Ts&... args) {
  std::cin >> value;
  read_from_cin(args...);
}
#define rd(type, ...) \
  type __VA_ARGS__;   \
  read_from_cin(__VA_ARGS__);
#define ints(...) rd(int, __VA_ARGS__);
#define strings(...) rd(string, __VA_ARGS__);

template <typename T>
void write_to_cout(const T& value) {
  if constexpr (std::is_same<T, bool>::value) {
    std::cout << (value ? "Yes" : "No");
  } else {
    std::cout << value;
  }
}
template <typename T, typename... Ts>
void write_to_cout(const T& value, const Ts&... args) {
  write_to_cout(value);
  std::cout << ' ';
  write_to_cout(args...);
}
#define wt(...)                 \
  do {                          \
    write_to_cout(__VA_ARGS__); \
    cout << '\n';               \
  } while (0)

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

#define rep_dispatch(_1, _2, _3, name, ...) name
#define rep3(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rep2(i, n) rep3(i, 0, n)
#define rep1(n) rep2(_loop_variable_, n)
#define rep(...) rep_dispatch(__VA_ARGS__, rep3, rep2, rep1)(__VA_ARGS__)

#define rrep(i, n) for (int i = (int)(n)-1; i >= 0; --i)

template <typename T>
std::istream& operator>>(std::istream& is, std::vector<T>& v) {
  for (T& vi : v) is >> vi;
  return is;
}

template <typename T, typename U>
bool chmax(T& a, U b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

template <typename T, typename U>
bool chmin(T& a, U b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}

template <typename T>
int sz(const T& v) {
  return v.size();
}

#include <boost/hana/functional/fix.hpp>
const auto& Fix = boost::hana::fix;

using ll = long long;

template <typename T>
using low_priority_queue =
    std::priority_queue<T, std::vector<T>, std::greater<T>>;

template <typename T>
using V = std::vector<T>;
template <typename T>
using VV = V<V<T>>;

template <typename T>
class SegmentTree {
 public:
  using Operation = std::function<T(T, T)>;
  SegmentTree(int size, Operation operation, T identity = T())
      : operation_(operation), identity_(identity) {
    int two = 1;
    while (two < size) {
      two <<= 1;
    }
    v_.resize(two * 2 - 1, identity_);
  }
  void Set(int i, T v) {
    int index = v_.size() / 2 + i;
    while (true) {
      v_[index] = v;
      if (index == 0) break;
      v = operation_(v, v_[index + (index % 2 == 0 ? -1 : 1)]);
      index = (index - 1) / 2;
    }
  }
  T Get(int i) const { return Aggregate(i, i + 1); }
  T Aggregate(int begin, int end) const {
    T lv = identity_, rv = identity_;
    int n = v_.size() / 2;
    for (int l = begin + n, r = end + n; l < r; l /= 2, r /= 2) {
      if (!(l & 1)) lv = operation_(lv, v_[l]);
      if (!(r & 1)) rv = operation_(rv, v_[--r]);
    }
    return operation_(lv, rv);
  }

 private:
  const Operation operation_;
  const T identity_;
  std::vector<T> v_;
};

using namespace std;

int main() {
  ints(H, W, m);
  VV<int> hw(H);
  V<int> hm(H), wm(W);
  rep(i, m) {
    ints(h, w);
    --h, --w;
    hw[h].push_back(w);
    hm[h]++;
    wm[w]++;
  }

  SegmentTree<int> tree(W, [](int a, int b) { return max(a, b); });
  rep(i, W) tree.Set(i, wm[i]);

  int ans = 0;
  rep(i, H) {
    for (int j : hw[i]) {
      tree.Set(j, wm[j] - 1);
    }
    chmax(ans, hm[i] + tree.Aggregate(0, W));
    for (int j : hw[i]) {
      tree.Set(j, wm[j]);
    }
  }
  wt(ans);
}


Measured memory_bytes: 26232