// Slower C++ solution:
#include<iostream>

#include<cstdio>

#include <stdio.h>

#include<algorithm>

#include<cstring>

#include <string>

#include<cmath>

#include<cstdlib>

#include<queue>

#include<map>

#include<vector>

#include<bits/stdc++.h>

#include <set>

#define ll   long long

#define IO ios::sync_with_stdio(false);cin.tie();cout.tie(0)

#define inf 0x3f3f3f

#define pi 3.1415926535898

using namespace std;

const int N=3e5+10;

const int mod=1e9+7;

int a[N],b[N];

ll maxs=-9999;

ll sum;

struct A

{

    int x,y;

};

map <pair<int,int >,int >mp;

int main()

{

    int h,w,m;

    int q[N],t[N];//记录最多障碍物的行和列。

    int cnt1,cnt2;//记录有多少条最多的行和列。

    cin>>h>>w>>m;

    int  sum1=0,sum2=0;//求最大的行和列。

    for(int i=0; i<m; i++)

    {

        int x,y;

        cin>>x>>y;

        mp[make_pair(x,y)]++;

        a[x]++;

        b[y]++;

    }

    for(int i=1; i<=h; i++)

    {

        if(sum1<a[i])

        {

            cnt1=0;

            memset(q,0,sizeof(q));

            sum1=max(sum1,a[i]);

            q[cnt1++]=i;

            while(sum1==a[i+1])

            {

                q[cnt1++]=i;

                i++;

            }

        }

        if(sum1==a[i])

        {

            q[cnt1++]=i;

            while(sum1==a[i+1])

            {

                q[cnt1++]=i;

                i++;

            }

        }

    }

    for(int i=1; i<=w; i++)

    {

        if(sum2<b[i])

        {

            cnt2=0;

            memset(t,0,sizeof(t));

            sum2=max(sum2,b[i]);

            t[cnt2++]=i;

            while(sum2==b[i+1])

            {

                t[cnt2++]=i;

                i++;

            }

        }

        if(sum2==b[i])

        {

            t[cnt2++]=i;

            while(sum2==b[i+1])

            {

                t[cnt2++]=i;

                i++;

            }

        }

    }

    sum=sum1+sum2;

    int xx=0;

    for(int i=0; i<cnt1; i++)

    {

        for(int j=0; j<cnt2; j++)

        {

            int x1,y1;

            x1=q[i];

            y1=t[j];

            if(mp[make_pair(x1,y1)]==0)//判断是否交点有障碍物

            {

                xx=1;

                break;

            }



        }

        if(xx==1)

        {

            break;

        }

    }

    if(xx==0)

    {

        sum--;

    }

    cout<<sum<<endl;

    return 0;

}




// Faster C++ solution for the same problem (measured speedup: 4.254141785482565x):
/*痛みを受け取れ，痛みを知れ*/

#include<bits/stdc++.h>

#define f(i,a,b) for(register int i=a;i<=b;++i)

#define ff(i,a,b) for(register int i=a;i>=b;--i)

#define debug(x) cerr << #x << " : " << x << " " << endl

using namespace std;

typedef long long ll;

typedef unsigned long long ull;

typedef long double ld;

typedef pair<int, int> pii;

typedef pair<string, string> pss;

const ll mod = 1e9 + 7;

const int inf = 0x3f3f3f3f;

const double tiaohe = 0.57721566490153286060651209;

ll oula(ll x) { ll res = x;f(i, 2, x / i) { if (x % i == 0) { res = res / i * (i - 1);while (x % i == 0) x /= i; } }if (x > 1) res = res / x * (x - 1);return res; }

ll quickmod(ll a, ll n, ll m) { ll s = 1;while (n) { if (n & 1) { s = s * a % m; }a = (a*a) % m;n = n / 2; }return s; }

ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }

void ex_gcd(ll a, ll b, ll &x, ll &y, ll &d) { if (!b) { d = a, x = 1, y = 0; } else { ex_gcd(b, a % b, y, x, d);y -= x * (a / b); } }

ll inv(ll t, ll p) { ll d, x, y;ex_gcd(t, p, x, y, d);return d == 1 ? (x % p + p) % p : -1; }

bool isPrime(ll x) { if (x == 2)return true;if (x % 2 == 0)return false;for (ll i = 2;i*i <= x;i++) if (x % i == 0)return false; return true; }

//double a = log(n) +tiaohe + 1.0 / (2 * n);

double eqa = (1 + sqrt(5.0)) / 2.0;

const int N = 3e5 + 5;

inline int in()

{

	char ch = getchar();

	int x = 0, f = 1;

	while (ch<'0' || ch>'9') { if (ch == '-')f = -1;ch = getchar(); }

	while (ch >= '0'&&ch <= '9') { x = x * 10 + ch - '0';ch = getchar(); }

	return x * f;

}//快读

int r[N], c[N];

int main()

{

	//freopen("in.txt", "r", stdin);

	int h, w, m;

	while (cin >> h >> w >> m)

	{

		int x, y;

		map<pii, int> mp;

		f(i, 1, m)

		{

			x = in();

			y = in();

			r[x]++;

			c[y]++;

			mp[{x, y}]++;

		}

		int mx = 0;

		vector<int> v;

		f(i, 1, h)

		{

			if (r[i] > mx)

			{

				v.clear();

				mx = r[i];

				v.emplace_back(i);

			}

			else if(r[i]==mx)

			{

				v.emplace_back(i);

			}

		}

		int mx2 = 0;

		vector<int> v2;

		f(j, 1, w)

		{

			if (c[j] > mx2)

			{

				mx2 = c[j];

				v2.clear();

				v2.emplace_back(j);

			}

			else if (c[j] == mx2)

			{

				v2.emplace_back(j);

			}

		}

		int ans = 0,fg=1;

		for (auto i : v)

		{

			for (auto j : v2)

			{

				if (mp[{i, j}] == 0) { fg = 0;break; }

			}

		}

		cout <<mx+mx2-fg << endl;

	}

	return 0;

}