#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define pli pair<ll, int>
#define pil pair<int, ll>
#define pll pair<ll, ll>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep3(i, l, n) for (int i = l; i < (n); ++i)
#define sz(v) (int)v.size()
#define endl '\n'
const int inf = 1000000007;
const ll INF = 1e18;
// int mod = 998244353;
int mod = 1000000007;
const double eps = 1e-8;
#define abs(x) (x >= 0 ? x : -(x))
#define lb(v, x) (int)(lower_bound(all(v), x) - v.begin())
#define ub(v, x) (int)(upper_bound(all(v), x) - v.begin())
template<typename T1, typename T2> inline bool chmin(T1 &a, T2 b) { if (a > b) { a = b; return 1; } return 0; }
template<typename T1, typename T2> inline bool chmax(T1 &a, T2 b) { if (a < b) { a = b; return 1; } return 0; }
ll gcd(ll a, ll b) { if (b == 0) return a; return gcd(b, a % b); }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
template<typename T, typename U> T pow_(T a, U b) { return b ? pow_(a * a, b / 2) * (b % 2 ? a : 1) : 1; }
ll modpow(ll a, ll b, ll _mod) { return b ? modpow(a * a % _mod, b / 2, _mod) * (b % 2 ? a : 1) % _mod : 1; }
template<class T, class U> ostream& operator << (ostream& os, const pair<T, U>& p) { os << p.F << " " << p.S; return os; }
template<class T> ostream& operator << (ostream& os, const vector<T>& vec) { rep(i, sz(vec)) { if (i) os << " "; os << vec[i]; } return os; }
template<class T> ostream& operator << (ostream& os, const set<T>& s) { for (auto si : s) os << si << " "; return os; }
template<typename T> inline istream& operator >> (istream& is, vector<T>& v) { rep(j, sz(v)) is >> v[j]; return is; }
template<class T, class T2> inline void add(T &a, T2 b) { (a += (b % mod + mod)) %= mod; }
template<class T> void operator += (vector<T>& v, vector<T> v2) { rep(i, sz(v2)) v.eb(v2[i]); }

void solve();

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cout << fixed << setprecision(12);
    int T;
    T = 1;
    while (T--) solve();
}

random_device rnd;
mt19937 mt(rnd());
uniform_int_distribution<> rand100(1, 300000);
uniform_int_distribution<> rand200(300, 400);
#define rm rand100(mt)
#define rm2 rand200(mt)

void solve() {
    int h, w, m;
    cin >> h >> w >> m;
    map<pii, int> mp;
    map<int, int> ys, xs;
    vector<int> y(m), x(m);
    
    rep(i, m) {
        cin >> y[i] >> x[i];
        ++ys[y[i]];
        ++xs[x[i]];
        ++mp[{y[i], x[i]}];
    }
    
    int ans = 0;
    int cnt1 = 0;
    set<int> y_;
    {
        int ma = 0;
        for (auto e : ys) chmax(ma, e.S);
        for (auto e : ys) if (e.S == ma) {
            ++cnt1;
            y_.emplace(e.F);
        }
        ans = ma;
    }
    int cnt2 = 0;
    set<int> x_;
    {
        int ma = 0;
        for (auto e : xs) chmax(ma, e.S);
        for (auto e : xs) if (e.S == ma) {
            ++cnt2;
            x_.emplace(e.F);
        }
        ans += ma;
    }
    
    int cnt3 = 0;
    rep(i, m) if (y_.count(y[i]) && x_.count(x[i])) ++cnt3;
    
    if (cnt3 == cnt1 * 1LL * cnt2) --ans;
    cout << ans << endl;
}




Measured memory_bytes: 80528