#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
 
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#define start_routine() int begtime = clock();
#define end_routine() int endtime = clock(); cerr << endl << "Time elapsed: " << (endtime - begtime)*1000/CLOCKS_PER_SEC << " ms"; return 0
#define speed() cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(false)
// #define exit(a, b) return cout << a, b;
 
// debugger
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
    cout << name << " : " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
    const char* comma = strchr(names + 1, ',');cout.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
}

template <class Ch, class Tr, class Container>
basic_ostream <Ch, Tr> & operator << (basic_ostream <Ch, Tr> & os, Container const& x) {
    os << "{ ";
    for(auto& y : x) os << y << ", ";
    return os << "}";
}
 
template <class X, class Y>
ostream & operator << (ostream & os, pair <X, Y> const& p) {
    return os << "[ " << p.first << ", " << p.second << " ]" ;
}

#define debug(stuff) cout << #stuff << ": " << stuff <<endl
#define debugc(stuff) cout << #stuff << ": "; for(auto x: stuff) cout << x << " "; cout << endl;
// 
 
#define loop(i,a,b) for(ll i=a;i<b;i++)
#define all(v) v.begin(), v.end() 
 
#define print(stuff) cout << stuff << endl
#define printc(stuff) for(auto x: stuff) cout << x << " "; cout << endl;
#define printPrec(stuff) cout << fixed << setprecision(15) << stuff << endl;
#define len length
#define ret0 return 0
#define ret return 
 
 
#define ll long long
#define ld long double
#define fi first
#define endl '\n'
#define se second
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define fill(ar, x) memset(ar, x, sizeof ar)
#define sz(a) (ll)(a).size()
 
#define vl vector<ll> 
#define sl set<ll>
#define pll pair<ll, ll>
#define mll map<ll, ll> 
#define pq priority_queue<ll>
 
// typedef tree<ll,null_type,less<ll>,rb_tree_tag,
// tree_order_statistics_node_update> indexed_set;
 
#define inf (long long int) 1e18
#define eps 0.000001
#define mod 1000000007
#define mod1 998244353
#define MAXN (ll)2e5+5
#define N (1ll<<10)
#define pi 3.141592653589793238462643

void solve(){
    ll h, w ,m;
    cin >> h >> w >> m;
    vl row[h];
    ll col[w] = {0};
    loop(i,0,m){
        ll x, y;
        cin >> x >> y;
        x--, y--;
        row[x].pb(y);
        col[y]++;
    }
    ll ans = -inf;
    multiset<ll> s;
    loop(i,0,w){
        s.insert(col[i]);
    }
    for(ll i = 0; i < h; i++){
        ll val = sz(row[i]);
        for(auto x: row[i]){
            ll old = col[x];
            s.erase(s.find(old));
            s.insert(old - 1);
        }
        // ret;
        auto it = s.end();
        it--;
        ans = max(ans, val + *it);
        // trace(val);
        for(auto x: row[i]){
            ll old = col[x];
            s.erase(s.find(old - 1));
            s.insert(old);
        }
    }   
    print(ans);
}
 
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    #ifndef ONLINE_JUDGE
        start_routine();
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
 
    ll t = 1;
    // cin>>t;
    while(t--){
        solve();
    }
        
    #ifndef ONLINE_JUDGE
        end_routine();
    #endif
}


Measured memory_bytes: 36428