//Don't have to see. start------------------------------------------
var read = require('readline').createInterface({
  input: process.stdin, output: process.stdout
});
var obj; var inLine = [];
read.on('line', function(input){inLine.push(input);});
read.on('close', function(){
  obj = init(inLine);
  console.error('\n↑入力 ↓出力');
  Main();
});
function makeClone(obj){return (obj instanceof Set) ? new Set(Array.from(obj)) : JSON.parse(JSON.stringify(obj));}
function nextInt(){return myconv(next(),1);} function nextStrArray(){return myconv(next(),2);}
function nextIntArray(){return myconv(next(),4);} function nextCharArray(){return myconv(next(),6);}
function next(){return obj.next();} function hasNext(){return obj.hasNext();}
function init(input){  
  return {
    list : input, index : 0, max : input.length,
    hasNext : function(){return (this.index < this.max);},
    next : function(){if(this.hasNext()){return this.list[this.index++];}else{throw 'ArrayIndexOutOfBoundsException ‚There is no more input';}}
  };
}
function myout(s){console.log(s);}
function myerr(s){console.error('debug:' + require('util').inspect(s,false,null));}
//param "no" is
//unknown or outlier : return i. 1: parseInt.
//2: split space. 4: split space and parseInt.
//6: split 1 character. 7: split 1 character and parseInt.
//8: join space. 9: join nextline. 0: join no character.
function myconv(i,no){try{switch(no){case 1:return parseInt(i);case 2:return i.split(' ');case 4:return i.split(' ').map(Number);case 6:return i.split('');case 7:return i.split('').map(Number);case 8:return i.join(' ');case 9:return i.join('\n');case 0:return i.join('');default:return i;}}catch(e){return i;}}

//Don't have to see. end------------------------------------------
function Main(){
  var one = nextIntArray();
  var H = one[0];
  var W = one[1];
  var M = one[2];
  var hCount = new Array(H);
  var wCount = new Array(W);
  for(var i = 0; i < H; i++){
    hCount[i] = {
      count : 0,
      no : i
    };
  }
  for(var i = 0; i < W; i++){
    wCount[i] = {
      count : 0,
      no : i
    };
  }
  var mlist = new Set();
  for(var i = 0; i < M; i++){
    var tmp = nextIntArray();
    var l = tmp[0] - 1;
    var r = tmp[1] - 1;
    mlist.add(l + ":" + r);
    hCount[l].count++;
    wCount[r].count++;
  }
  hCount.sort(function(a,b){
    return b.count - a.count;
  });
  wCount.sort(function(a,b){
    return b.count - a.count;
  });
  var hMax = hCount[0].count;
  var wMax = wCount[0].count;
  var output = hMax + wMax - 1;
  var isOK = false;
  for(var i = 0; i < hCount.length; i++){
    if(isOK){
      break;
    }
    if(hCount[i].count < hMax){
      break;
    }
    for(var j = 0; j < wCount.length; j++){
      if(wCount[j].count < wMax){
        break;
      }
      if(!mlist.has(hCount[i].no + ":" + wCount[j].no)){
        output++;
        isOK = true;
        break;
      }
    }
  }
  myout(output);
}