using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using static System.Console;
using static System.Math;
using static Atcoder.IO;

namespace Atcoder
{
    class Program
    {
        static StreamWriter sw = new StreamWriter(OpenStandardOutput()) { AutoFlush = false };
        static void Main(string[] args)
        {
            try
            {
                SetOut(sw);
                Solve.Answer();
                Out.Flush();
            }
            catch (Exception ex)
            {
                WriteLine(ex.ToString());
                Out.Flush();
            }
        }
    }

    public class Solve
    {
        public static void Answer()
        {
            var HWN = RSInt;

            long[] row = new long[HWN[0]];
            long[] col = new long[HWN[1]];

            var lis = new HashSet<(int x, int y)>();
            for (int i = 0; i < HWN[2]; i++)
            {
                var t = RSInt;
                lis.Add((t[0] - 1, t[1] - 1));
                row[t[0] - 1]++;
                col[t[1] - 1]++;
            }

            var maxRows = new List<int>();
            var maxR = row.Max();
            for (int i = 0; i < row.Length; i++)
            {
                if (row[i] == maxR)
                    maxRows.Add(i);
            }
            var maxCols = new List<int>();
            var maxC = col.Max();
            for (int i = 0; i < col.Length; i++)
            {
                if (col[i] == maxC)
                    maxCols.Add(i);
            }
            long ans = maxR + maxC;

            bool minus = true;
            for (int i = 0; i < maxRows.Count; i++)
            {
                for (int j = 0; j < maxCols.Count; j++)
                {
                    if (lis.Add((maxRows[i], maxCols[j])))
                    {
                        minus = false;
                        break;
                    }
                }
                if (!minus) break;
            }
            if (minus)
                ans--;

            WriteLine(ans);
        }
    }

    public class IO
    {
        #region Input
        public static int RInt => int.Parse(ReadLine());
        public static long RLong => long.Parse(ReadLine());
        public static double RDouble => double.Parse(ReadLine());

        public static string[] RSString => ReadLine().Split();
        public static int[] RSInt => ReadLine().Split().Select(s => int.Parse(s)).ToArray();
        public static long[] RSLong => ReadLine().Split().Select(s => long.Parse(s)).ToArray();
        public static double[] RSDouble => ReadLine().Split().Select(s => double.Parse(s)).ToArray();
        #endregion

        #region Output
        public static void OutJoinSpace<T>(IEnumerable<T> list) => WriteLine(string.Join(" ", list));
        public static void WriteLineYes_or_No(bool flag) => WriteLine(flag ? "Yes" : "No");
        public static void WriteLineYES_or_NO(bool flag) => WriteLine(flag ? "YES" : "NO");
        #endregion
    }

    public class Mod
    {
        #region
        private readonly static long M = 1000000007;

        public static long Add(long a, long b) => (a * b) % M;
        public static long Sub(long a, long b) => (a - b) % M >= 0 ? (a - b) % M : (a - b) % M + M;
        public static long Multi(long a, long b) => (a * b) % M;
        #endregion
    }
}

Measured memory_bytes: 69620