using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

namespace ABC176_E
{
    using static Ex;
    public class E
    {
        public static void Main(string[] args)
        {
            new ABC();
        }
    }

    public class ABC
    {
        public ABC()
        {
            var (h, w, m) = ReadIntArray().ToTpl3();
            var harr = new int[h + 1];
            var warr = new int[w + 1];
            var set = new HashSet<(int, int)>();
            for (int i = 0; i < m; i++)
            {
                var (y, x) = ReadIntArray().ToTpl2();
                harr[y]++;
                warr[x]++;
                set.Add((y, x));
            }
            var aw = warr.Select((item, indx) => new { Item = item, Index = indx }).OrderByDescending(x => x.Item).ToArray();
            var ah = harr.Select((item, indx) => new { Item = item, Index = indx }).OrderByDescending(x => x.Item).ToArray();
            var mw = aw.FirstOrDefault().Item;
            var mh = ah.FirstOrDefault().Item;
            long ans = mw + mh;
            for (int i = 0; i < w && aw[i].Item == mw; i++)
            {
                for (int j = 0; j < h && ah[j].Item == mh; j++)
                {

                    if (!set.Contains((ah[j].Index, aw[i].Index)))
                    {
                        ans.Cw();
                        return;
                    }
                }
            }
            (ans - 1).Cw();
        }

    }

    public static class Ex
    {
        public static void Cw(this object s) { Console.WriteLine(s); }



        public static bool Mins<T>(ref T a, T b) where T : IComparable<T> { if (a.CompareTo(b) > 0) { a = b; return true; } return false; }
        public static bool Maxs<T>(ref T a, T b) where T : IComparable<T> { if (a.CompareTo(b) < 0) { a = b; return true; } return false; }
        public static void Swap<T>(ref T a, ref T b) { var t = b; b = a; a = t; }
        public static void Swap<T>(List<T> list, int i, int j) { T tmp = list[j]; list[j] = list[i]; list[i] = tmp; }

        public static long Lcm(int x, int y) { return x / Gcd(x, y) * y; }
        public static long Gcd(long m, long n) { if (n == 0) return m; return Gcd(n, m % n); }
        public static List<string> FastSort(this List<string> s) { s.Sort(StringComparer.Ordinal); return s.ToList(); }
        public static void yesno(this bool b) { (b ? "yes" : "no").Cw(); }
        public static void YesNo(this bool b) { (b ? "Yes" : "No").Cw(); }
        public static void YESNO(this bool b) { (b ? "YES" : "NO").Cw(); }

        public static string Read { get { return Console.ReadLine().Trim(); } }
        public static int ReadInt { get { return int.Parse(Read); } }
        public static long ReadLong { get { return long.Parse(Read); } }
        public static double ReadDouble { get { return double.Parse(Read); } }
        public static string[] ReadArray() { return Read.Split(' '); }
        public static int[] ReadIntArray() { return Read.Split(' ').Select(int.Parse).ToArray(); }
        public static long[] ReadLongArray() { return Read.Split(' ').Select(long.Parse).ToArray(); }
        public static string[] ReadArray(long N) { var v = new string[N]; for (long i = 0; i < N; ++i) v[i] = Read; return v; }
        public static int[] ReadIntArray(long N) { var v = new int[N]; for (long i = 0; i < N; ++i) v[i] = ReadInt; return v; }
        public static long[] ReadLongArray(long N) { var v = new long[N]; for (long i = 0; i < N; ++i) v[i] = ReadLong; return v; }

        public static (T, T) ToTpl2<T>(this T[] v) { return (v[0], v[1]); }
        public static (T, T, T) ToTpl3<T>(this T[] v) { return (v[0], v[1], v[2]); }
        public static (T, T, T, T) ToTpl4<T>(this T[] v) { return (v[0], v[1], v[2], v[3]); }
        public static (T, T, T, T, T) ToTpl5<T>(this T[] v) { return (v[0], v[1], v[2], v[3], v[4]); }

    }
}


Measured memory_bytes: 77452