#include<bits/stdc++.h>
#define ll long long
#define all(v) v.begin(),v.end()
#define PB push_back
#define PI 3.1415926535897932384626433832795
#define what(x) cout<<#x<<" is "<<x<<endl;
using namespace std;


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 << endl; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
#ifndef ONLINE_JUDGE
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

ll powmod(ll a,ll b,ll mod) {
    ll res=1;a%=mod;
    //assert(b>=0);
    for(;b;b>>=1){
        if(b&1)res=res*a%mod;a=a*a%mod;
    }
    return res;
}
map<int,int> hor,ver;
map<pair<int,int>,int> arr;
void solve(){
	int H,W,M;
	cin>>H>>W>>M;
	for(int x,y,i=0;i<M;i++){
		cin>>x>>y;
		arr[make_pair(x,y)]++;
		hor[x]++,ver[y]++;
	}
	int xmx=0,ymx=0;
	vector<int> xm,ym;
	for(auto it:hor){
		xmx=max(xmx,it.second);
	}
	for(auto it:hor){
		if(xmx==it.second)xm.push_back(it.first);
	}
	for(auto it:ver){
		ymx=max(ymx,it.second);
	}
	for(auto it:ver){
		if(ymx==it.second)ym.push_back(it.first);
	}
	int ans=0,mx=xmx+ymx;
	for(int i=0;ans!=mx&&i<(int)xm.size();i++){
		for(int j=0;ans!=mx&&j<(int)ym.size();j++){
			ans=max(ans,hor[xm[i]]+ver[ym[j]]-arr[make_pair(xm[i],ym[j])]);
		}
	}
	cout<<ans<<'\n';
	

}


int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int tc=1;
	#ifndef ONLINE_JUDGE
	freopen("input.txt","r",stdin);
	#endif
	// cin>>tc;
    while(tc--)solve();
}


Measured memory_bytes: 54304