#include <algorithm>
#include <complex>
#include <cstdlib>
#include <ctime>
#include <time.h>
#include <iomanip>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <numeric>
#include <limits>
#include <type_traits>
#include <locale>
#include <omp.h>

using namespace std;
#define SAY_YES cout << "YES" << endl;
#define SAY_Yes cout << "Yes" << endl;
#define SAY_NO cout << "NO" << endl;
#define SAY_No cout << "No" << endl;
#define IFYES(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "YES" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "NO" << endl;  \
    }
#define IFYes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "Yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "No" << endl;  \
    }
#define IFyes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "no" << endl;  \
    }
#define DEBUG_OUTPUT_ARRAY(XXX, ONE)                            \
    for (int i = 0; i < (ONE); i++)                             \
    {                                                           \
        cout << "DEBUG: i = " << i << " -> " << XXX[i] << endl; \
    }
#define DEBUG_OUTPUT_ARRAY2(XXX, ONE, TWO)                             \
    for (int i = 0; i < (ONE); i++)                                    \
    {                                                                  \
        cout << "<<< i = " << i << " >>>" << endl;                     \
        for (int j = 0; j < (TWO); j++)                                \
        {                                                              \
            cout << "DEBUG: j = " << j << " -> " << XXX[i][j] << endl; \
        }                                                              \
    }
#define DEBUG_OUTPUT_ARRAY2_BOX(XXX, ONE, TWO) \
    for (int i = 0; i < (ONE); i++)            \
    {                                          \
        cout << i << "  ";                     \
        for (int j = 0; j < (TWO); j++)        \
        {                                      \
            cout << XXX[i][j] << " ";          \
        }                                      \
        cout << endl;                          \
    }

typedef pair<long long int, long long int> pll;
typedef pair<long long int, pll> lpll;

const long long int mod = 1000000007;
const long long int INF = 1e18;
const long double PI=3.14159265358979323; 
//const long long int pl=1000000;

long long int H,W,M,h[300200],w[300200],res[2000][2000]={},sum=0,A[200200],now=0;
char S[2000][2000];
long long int tmpH[300030]={},tmpW[300300]={},maxH=0,maxW=0,countH=0,countW=0;
map<pll,bool>mp;
vector<long long int>Hmemo,Wmemo;
int main(){
    cout << fixed << setprecision(18);
    cin>>H>>W>>M;
    for(long long int i = 0; i < M; i++){
        cin>>h[i]>>w[i];
        tmpH[h[i]]++;
        tmpW[w[i]]++;
        mp[{h[i],w[i]}]=true;
    }
    
    for(long long int i = 1; i <= H; i++){
        maxH=max(maxH,tmpH[i]);
    }
    for(long long int i = 1; i <= W; i++){
        maxW=max(maxW,tmpW[i]);
    }
    
    for(long long int i = 1; i <= H; i++){
        if(maxH==tmpH[i]){countH++;Hmemo.push_back(i);}
    }
    for(long long int i = 1; i <= W; i++){
        if(maxW==tmpW[i]){countW++;Wmemo.push_back(i);}
    }

    if(countH*countW>M){cout<<maxH+maxW<<endl;}
    else{
        for(long long int i = 0; i < Hmemo.size(); i++){
            for(long long int j = 0; j < Wmemo.size(); j++){
                if(mp.find({Hmemo[i],Wmemo[j]})==mp.end()){
                    cout<<maxH+maxW<<endl;
                    return 0;
                }
            }
        }
        cout<<maxH+maxW-1<<endl;
                    return 0;
    }
}



Measured memory_bytes: 39688