#ifdef LOCAL
    #define _GLIBCXX_DEBUG
    #define __clock__
#else
    #pragma GCC optimize("Ofast")
#endif
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using VI = vector<ll>;
using VV = vector<VI>;
using VS = vector<string>;
using PII = pair<ll, ll>;

// tourist set
template <typename A, typename B>
string to_string(pair<A, B> p);

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);

string to_string(const string& s) {
  return '"' + s + '"';
}

string to_string(const char* s) {
  return to_string((string) s);
}

string to_string(bool b) {
  return (b ? "true" : "false");
}

string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}

template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) {
    res += static_cast<char>('0' + v[i]);
  }
  return res;
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}

void debug_out() { cerr << '\n'; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
// tourist set end

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define rep(i,b) FOR(i, 0, b)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<'\n'
#define p2(s, t) cout << (s) << " " << (t) << '\n'
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << '\n'
#define SZ(x) ((int)(x).size())
#define SORT(A) sort(ALL(A))
#define RSORT(A) sort(ALL(A), greater<ll>())
#define MP make_pair
#define p_yes() p("YES")
#define p_no() p("NO")
#define possible() p("Possible")
#define impossible() p("Impossible")

ll SUM(VI& V){
  return accumulate(ALL(V), 0LL);
}

ll MIN(VI& V){return *min_element(ALL(V));}
ll MAX(VI& V){return *max_element(ALL(V));}

void print_vector(VI& V){
  ll n = V.size();
  rep(i, n){
    if(i) cout << ' ';
    cout << V[i];
  }
  cout << endl;
}

ll gcd(ll a,ll b){
    if(b == 0) return a;
    return gcd(b,a%b);
}

ll lcm(ll a,ll b){
    ll g = gcd(a,b);
    return a / g * b;
}

// long double
using ld = long double;
#define EPS (1e-14)
#define equals(a,b) (fabs((a)-(b)) < EPS)

void no(){p_no(); exit(0);}
void yes(){p_yes(); exit(0);}

const ll mod = 1e9 + 7;
const ll inf = 1e18;
const double PI = acos(-1);

// snuke's mint
// auto mod int
// https://youtu.be/L8grWxBlIZ4?t=9858
// https://youtu.be/ERZuLAxZffQ?t=4807 : optimize
// https://youtu.be/8uowVvQ_-Mo?t=1329 : division
// const int mod = 1000000007;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) {
    (x *= a.x) %= mod;
    return *this;
  }
  mint operator+(const mint a) const {
    mint res(*this);
    return res+=a;
  }
  mint operator-(const mint a) const {
    mint res(*this);
    return res-=a;
  }
  mint operator*(const mint a) const {
    mint res(*this);
    return res*=a;
  }
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const {
    return pow(mod-2);
  }
  mint& operator/=(const mint a) {
    return (*this) *= a.inv();
  }
  mint operator/(const mint a) const {
    mint res(*this);
    return res/=a;
  }
};

struct UnionFind{
    vector<ll> parent;
    UnionFind(ll sz){
        parent.resize(sz);
        reset();
    }

    void reset(){
        FOR(i, 0, parent.size()){
            parent[i] = i;
        }
    }

    void unite(ll a, ll b){
        if(a>b){
            swap(a, b);
        }
        ll rootA = findRoot(a);
        ll rootB = findRoot(b);
        if(rootA>rootB){
            swap(rootA, rootB);
        }
        if(rootA==rootB){
            return;
        }else{
            // 小さい方を親にする
            parent[rootB] = rootA;
        }
    }

    ll findRoot(ll a){
        if(parent[a]==a){
            return a;
        }else{
            return parent[a] = findRoot(parent[a]);
        }
    }

    map<ll, vector<ll> > getGroups(){
        map<ll, vector<ll> > G;
        FOR(i, 0, parent.size()){
            ll r = findRoot(i);
            G[r].push_back(i);
        }
        return G;
    }

    bool is_same_group(ll a, ll b){
        ll rootA = findRoot(a);
        ll rootB = findRoot(b);
        if(rootA==rootB){
            return true;
        }else{
            return false;
        }
    }
};

vector<PII> f(VI A){
  ll N = SZ(A);
  vector<PII> ret;
  rep(i,N){
    ll a = A[i];
    ret.push_back({a,i});
  }
  sort(ALL(ret), greater<PII>());
  return ret;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll H,W,M;
    cin>>H>>W>>M;

    VI Y(M);
    VI X(M);
    map<PII,ll> id;
    rep(i,M){
      cin>>Y[i]>>X[i];
      Y[i]--;
      X[i]--;
      id[{Y[i],X[i]}]=i;
    }

    VI CY(H);
    VI CX(W);
    rep(i,M){
      ll y = Y[i];
      ll x = X[i];
      CY[y]++;
      CX[x]++;
    }

    debug(CY);
    debug(CX);

    ll cy_max = MAX(CY);
    ll cx_max = MAX(CX);

    auto AY = f(CY);
    auto AX = f(CX);

    ll ma = AY[0].first + AX[0].first - 1;
    for(auto paY : AY){
      if(paY.first!=cy_max) break;
      for(auto paX : AX){
        if(paX.first != cx_max) break;

        ll index_y = paY.second;
        ll index_x = paX.second;
        if(id.count({index_y,index_x})==0){
          p(cy_max + cx_max); return 0;
        }
      }
    }
    p(ma);




    // UnionFind uf(M);

    // // Y軸ごと
    // {
    //   map<ll,VI> mp;
    //   rep(i,M){
    //     ll y = Y[i];
    //     ll x = X[i];
    //     mp[y].push_back(x);
    //   }
    //   for(auto pa : mp){
    //     ll y = pa.first;
    //     VI V = pa.second;
    //     SORT(V);
    //     ll L = V.size();
    //     rep(i,L-1){
    //       ll id0 = id[{y,V[i]}];
    //       ll id1 = id[{y,V[i+1]}];
    //       uf.unite(id0, id1);
    //     }
    //   }
    // }

    // {
    //   map<ll,VI> mp;
    //   rep(i,M){
    //     ll y = Y[i];
    //     ll x = X[i];
    //     mp[x].push_back(y);
    //   }
    //   for(auto pa : mp){
    //     ll x = pa.first;
    //     VI V = pa.second;
    //     SORT(V);
    //     ll L = V.size();
    //     rep(i,L-1){
    //       ll id0 = id[{V[i],x}];
    //       ll id1 = id[{V[i+1],x}];
    //       uf.unite(id0, id1);
    //     }
    //   }
    // }

    // auto mp = uf.getGroups();
    // ll ma = 0;
    // for(auto pa : mp){
    //   chmax(ma, (ll)SZ(pa.second));
    // }    
    // p(ma);



    return 0;
}

Measured memory_bytes: 50552