#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <climits>
#include <cstring>
#include <cassert>


using namespace std;
#define SZ(x) (int)(x.size())
#define REP(i, n) for(int i=0;i<n;++i)
#define FOR(i, a, b) for(int i=a;i<b;++i)
#define RREP(i, n) for(int i=n-1;i>=0;--i)
#define RFOR(i, a, b) for(int i=b-1;i>=a;--i)

#define all(x) begin(x),end(x)
#define dump(x) cerr<<#x<<" = "<<(x)<<endl
#define debug(x) cerr<<#x<<" = "<<(x)<<" (L"<<__LINE__<<")"<< endl;

using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using P = pair<int, int>;
const double eps = 1e-8;
const ll MOD = 1000000007;
const int INF = INT_MAX / 2;
const ll LINF = LLONG_MAX / 2;

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

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


template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> p) {
    os << p.first << ":" << p.second;
    return os;
}

template<class T>
ostream &operator<<(ostream &os, const vector<T> &v) {
    os << "[";
    REP(i, SZ(v)) {
        if (i) os << ", ";
        os << v[i];
    }
    return os << "]";
}

template<class T1, class T2>
ostream &operator<<(ostream &os, const map<T1, T2> &mp) {
    os << "[";
    for (auto it = mp.begin(); it != mp.end(); ++it) {
        if (it != mp.begin()) {
            os << ", ";
        }
        os << *it;
    }
    return os << "]";
}

// edit

void solve() {
    int H, W, M;
    cin >> H >> W >> M;

    set<pair<int, int>> ext;
    vector<int> row(H);
    vector<int> col(W);

    for (int i = 0; i < M; ++i) {
        int h, w;
        cin >> h >> w;
        h--;
        w--;
        row[h]++;
        col[w]++;
        ext.insert(make_pair(h, w));
    }

    int r_cnt = *max_element(all(row)), c_cnt = *max_element(all(col));
    vector<int> max_r, max_c;
    for (int i = 0; i < H; ++i) {
        if (r_cnt == row[i]) {
            max_r.push_back(i);
        }
    }

    for (int i = 0; i < W; ++i) {
        if (c_cnt == col[i]) {
            max_c.push_back(i);
        }
    }

    if (1ll * max_r.size() * max_c.size() > M) {
        int ans = r_cnt + c_cnt;
        cout << ans << endl;
        return;
    }

    for (auto r : max_r) {
        for (auto c : max_c) {
            if (!ext.count(make_pair(r, c))) {
                int ans = r_cnt + c_cnt;
                cout << ans << endl;
                return;
            }
        }
    }

    int ans = r_cnt + c_cnt - 1;
    cout << ans << endl;
    return;


}


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
//    std::ifstream in("input.txt");
//    std::cin.rdbuf(in.rdbuf());

    solve();


    return 0;
}


Measured memory_bytes: 23348