#include <iostream>
#include <cmath>
#include <iomanip>
#include <vector>
#include <stack>
#include <queue>
#include <list>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <algorithm>
#include <iterator>
#include <unordered_map>
#include <unordered_set>
#include <sstream>
#include <fstream>
#include <numeric>
#include <tuple>

using namespace std;

#define fori(t) for(int i = 0; i < t; ++i)
#define forj(n) for(int j = 0; j < n; ++j)
#define fork(n) for(int k = 0; k < n; ++k)
#define forai(a) for(auto& i : a)
#define foraj(a) for(auto& j : a)
#define forak(a) for(auto& k : a)
#define forp(s, n, d) for(int p = s; p < n; p += d)
#define fast cin.tie(0); cout.tie(0); std::ios_base::sync_with_stdio(0);
#define pb(a) push_back(a);
#define pob(a) pop_back(a);
#define sorti(a) sort(a.begin(), a.end());
#define sortm(a, n) sort(a, a + n);
#define reversi(a) reverse(a.begin(), a.end());
#define fi first
#define se second
#define yes cout << "Yes\n";
#define no cout << "No\n";
#define ans(a) cout << a << '\n';
#define res(a, n) a.resize(n);
#define read(a, n) a.resize(n); fori(n) cin >> a[i];
//#define int long long
//#define double long double

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef pair<long long, long long> llll;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<pair<int, int>> vii;
typedef vector<pair<int, pair<int, int>>> viii;
typedef pair<int, pair<int, int>> iii;
typedef vector<pair<long long, long long>> vllll;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
typedef vector<bool> vb;
typedef pair<char, char> cc;
typedef pair<pair<char, char>, char> ccc;
typedef vector<char> vc;
typedef pair<int, char> ic;
typedef pair<ii, char> iic;
typedef vector<bool> vb;
typedef set<int> si;
typedef set<ii> sii;
typedef unsigned long long ull;
typedef pair<ull, ull> ullll;
typedef pair<double, double> dd;
typedef vector<dd> vdd;
typedef vector<pair<ull, ull>> vullll;
typedef pair<bool, bool> bb;
typedef vector<bb> vbb;
typedef vector<vector<ii>> vvii;
typedef vector<vector<iii>> vviii;

const int INF = 2147483647;
const ll LONGINF = 9223372036854775807;
const ll MOD = 1e9 + 7;

vi row, column;
vii ins;
si maxRows, maxCols;

void solve()
{
    int h, w, m;
    cin >> h >> w >> m;
    res(row, h)
    res(column, w)
    int maxRow = 0, maxCol = 0;
    while (m--)
    {
        int hi, wi;
        cin >> hi >> wi;
        ++row[hi - 1];
        ++column[wi - 1];
        maxRow = max(maxRow, row[hi - 1]);
        maxCol = max(maxCol, column[wi - 1]);
        ins.push_back({hi - 1, wi - 1});
    }
    fori(h) if (row[i] == maxRow) maxRows.insert(i);
    fori(w) if (column[i] == maxCol) maxCols.insert(i);
    ll countBoms = 0;
    forai(ins)
    {
        if (maxRows.find(i.fi) != maxRows.end() && maxCols.find(i.se) != maxCols.end()) ++countBoms;
    }
    if ((((long long) maxRows.size()) * ((long long) maxCols.size())) == countBoms) ans(maxRow + maxCol - 1)
    else ans(maxRow + maxCol)
}

signed main()
{
    fast
    bool mult = false;
    if (mult)
    {
        int t;
        cin >> t;
        while (t--) solve();
    }
    else solve();
    return 0;
}


Measured memory_bytes: 36024