using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using static System.Console;
using static System.Math;

class program
{
    static public int mod = 1000000007;
    static void Main()
    {
        int[] z = inta();
        int h = z[0], w = z[1], m = z[2];
        int[] hmx = new int[w];
        int[] wmx = new int[h];
        var bom = new Dictionary<string, bool>();
        for (int i = 0; i < m; i++)
        {
            string hw = rstr();
            string[] hws = hw.Split(' ');
            int x = int.Parse(hws[0]) - 1, y = int.Parse(hws[1]) - 1;
            wmx[x]++;
            hmx[y]++;
            bom.Add(hw, true);
        }
        int hmax = 0;
        var wlist = new List<int>();
        for (int i = 0; i < w; i++)
        {
            if (hmax < hmx[i])
            {
                hmax = hmx[i];
                wlist.Clear();
                wlist.Add(i);
            }
            else if (hmax == hmx[i])
            {
                wlist.Add(i);
            }
        }

        int wmax = 0;
        var hlist = new List<int>();
        for (int i = 0; i < h; i++)
        {
            if (wmax < wmx[i])
            {
                wmax = wmx[i];
                hlist.Clear();
                hlist.Add(i);
            }
            else if (wmax == wmx[i])
            {
                hlist.Add(i);
            }
        }

        int ans = wmax + hmax;

        foreach (int i in wlist)
        {
            string si = (i+1).ToString();
            foreach (int j in hlist)
            {
                string js = (j+1).ToString();
                
                if (!bom.ContainsKey(js + " " + si))
                {
                    Write(ans);
                    return;
                }
            }
        }

        Write((ans - 1));
    }

    static int pow(int a, int b) { string binary = Convert.ToString(b, 2); int bileng = binary.Length; long a_power = a; long value = 1; for (int i = bileng - 1; i >= 0; i--) { if (binary[i] == '1') { value = value * a_power % mod; } a_power = a_power * a_power % mod; } return (int)value; }
    static string rstr() { return ReadLine(); }
    static int rint() { return int.Parse(ReadLine()); }
    static long rlong() { return long.Parse(ReadLine()); }
    static string[] stra() { return ReadLine().Split(' '); }
    static char[] chara() { string[] a = stra(); string b = ""; for (int i = 0; i < a.Length; i++) { b += a[i]; } return b.ToCharArray(); }
    static int[] inta() { string[] read_str_array = ReadLine().Split(' '); int[] return_int_array = new int[read_str_array.Length]; for (int countup_i = 0; countup_i < read_str_array.Length; countup_i++) { return_int_array[countup_i] = int.Parse(read_str_array[countup_i]); } return return_int_array; }
    static long[] longa() { string[] read_str_array = ReadLine().Split(' '); long[] return_long_array = new long[read_str_array.Length]; for (long countup_i = 0; countup_i < read_str_array.Length; countup_i++) { return_long_array[countup_i] = long.Parse(read_str_array[countup_i]); } return return_long_array; }
    static double[] doublea() { string[] read_str_array = ReadLine().Split(' '); double[] return_double_array = new double[read_str_array.Length]; for (long countup_i = 0; countup_i < read_str_array.Length; countup_i++) { return_double_array[countup_i] = double.Parse(read_str_array[countup_i]); } return return_double_array; }
    static long GCD(long a, long b) { if (a < b) { long temp = a; a = b; b = temp; } if (a % b == 0) { return b; } else { long temp = b; b = a % b; a = temp; return GCD(a, b); } }
    static long LCM(long a, long b) { return a * b / GCD(a, b); }
    static void WriteArray2(int[,] a, int b, int c) { for (int i = 0; i < b; i++) { for (int j = 0; j < c; j++) { if (j != 0) Write(" "); Write(a[i, j]); } WriteLine(); } }
    static void WriteArray(int[] a, int b) { for (int i = 0; i < b; i++) { Write(" "); Write(a[i]); } WriteLine(); }
}


Measured memory_bytes: 74064