#pragma GCC optimize("Ofast") 
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define mp make_pair                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(998244353)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
map<pii,bool>used;
ll x[333333];
ll y[333333];
int main()
{
	owo
	ll h,w,n;
	cin>>h>>w>>n;
	ll mxx = 0;
	ll mxy = 0;
	for(int i=0;i<n;i++){
		int a,b;
		cin>>a>>b;
		x[a]++;
		y[b]++;
		mxx = max(x[a],mxx);
		mxy = max(y[b],mxy);
		used[{a,b}] = 1;
	}
	vector<ll>tx,ty;
	for(int i=1;i<=h;i++)if(x[i] == mxx)tx.pb(i);
	for(int i=1;i<=w;i++)if(y[i] == mxy)ty.pb(i);
	for(ll p:tx){
		for(ll q:ty){
		   if(!used[{p,q}]){
			   cout<<mxx+mxy;
			   return 0;
		   }	
		}
	}
	cout<<mxx+mxy-1;
}


Measured memory_bytes: 34976