import std.stdio;
import std.string;
import std.format;
import std.conv;
import std.typecons;
import std.algorithm;
import std.functional;
import std.bigint;
import std.numeric;
import std.array;
import std.math;
import std.range;
import std.container;
import std.concurrency;
import std.traits;
import std.uni;
import std.regex;
import core.bitop : popcnt;

alias Generator = std.concurrency.Generator;

enum long INF = long.max / 5;

void main() {
  long H, W, M;
  scanln(H, W, M);

  auto seg = SegTree!(
      long, max, 0
  )(W);

  long[][] xss = new long[][H];
  foreach (i; 0 .. M) {
    long h, w;
    scanln(h, w);
    h--;
    w--;
    xss[h] ~= w;
    seg.update(w, seg.get(w) + 1);
  }

  long ans = 0;
  foreach (h; 0 .. H) {
    long c = xss[h].length;
    foreach (w; xss[h]) {
      seg.update(w, seg.get(w) - 1);
    }
    c += seg.query(0, W);
    assert(c <= M);
    ans.ch!max(c);
    foreach (w; xss[h]) {
      seg.update(w, seg.get(w) + 1);
    }
  }
  ans.writeln;
}

import std.functional;

// // RMQ (Range Minimum Query)
// alias RMQ(T) = SegTree!(T, "a<b ? a:b", T.max);

// Segment Tree
//    - with 1-based array
struct SegTree(T, alias fun, T initValue, bool structly = true)
if (is(typeof(binaryFun!fun(T.init, T.init)) : T)) {

  import std.algorithm : map;
  import std.array : array;

private:
  alias _fun = binaryFun!fun;
  Pair[] _data;
  size_t _size;
  size_t _l, _r;

public:

  // size: データ数
  this(size_t size) {
    init(size);
  }

  // 配列で指定
  this(T[] xs) {
    init(xs.length);
    update(xs);
  }

  // O(N)
  void init(size_t size) {
    _size = 1;
    while (_size < size) {
      _size *= 2;
    }
    _data.length = _size * 2;
    _data[] = Pair(size_t.max, initValue);
    _l = 0;
    _r = size;
  }

  // i番目の要素をxに変更
  // O(logN)
  void update(size_t i, T x) {
    size_t index = i;
    _data[i += _size] = Pair(index, x);
    while (i > 0) {
      i >>= 1;
      Pair nl = _data[i * 2 + 0];
      Pair nr = _data[i * 2 + 1];
      _data[i] = select(nl, nr);
    }
  }

  // 配列で指定
  // O(N)
  void update(T[] ary) {
    foreach (i, e; ary) {
      _data[i + _size] = Pair(i, e);
    }
    foreach_reverse (i; 1 .. _size) {
      Pair nl = _data[i * 2 + 0];
      Pair nr = _data[i * 2 + 1];
      _data[i] = select(nl, nr);
    }
  }

  // 区間[a, b)でのクエリ (valueの取得)
  // O(logN)
  T query(size_t a, size_t b) {
    Pair pair = accumulate(a, b);
    // Pair pair = queryRec(a, b, 0, 0, _size);
    return pair.value;
  }

  // 区間[a, b)でのクエリ (indexの取得)
  // O(logN)
  size_t queryIndex(size_t a, size_t b)
  out (result) {
    // fun == (a, b) => a+b のようなときはindexを聞くとassertion
    if (structly)
      assert(result != size_t.max);
  }
  body {
    Pair pair = accumulate(a, b);
    return pair.index;
  }

  // 区間[a, b)でのクエリ ((index, value)の取得)
  // O(logN)
  Pair queryPair(size_t a, size_t b)
  out (result) {
    // fun == (a, b) => a+b のようなときはindexを聞くとassertion
    if (structly)
      assert(result.index != size_t.max);
  }
  body {
    Pair pair = accumulate(a, b);
    // Pair pair = queryRec(a, b, 0, 0, _size);
    return pair;
  }

  // O(1)
  T get(size_t i) {
    return _data[_size + i].value;
  }

  // O(N)
  T[] array() {
    return _data[_l + _size .. _r + _size].map!"a.value".array;
  }

private:

  struct Pair {
    size_t index;
    T value;
  }

  Pair select(Pair nl, Pair nr) {
    T v = _fun(nl.value, nr.value);
    if (nl.value == v) {
      return nl;
    } else if (nr.value == v) {
      return nr;
    } else {
      return Pair(size_t.max, v);
    }
  }

  Pair accumulate(size_t l, size_t r) {
    if (r <= _l || _r <= l)
      return Pair(size_t.max, initValue);
    Pair accl = Pair(size_t.max, initValue);
    Pair accr = Pair(size_t.max, initValue);
    for (l += _size, r += _size; l < r; l >>= 1, r >>= 1) {
      if (l & 1)
        accl = select(accl, _data[l++]);
      if (r & 1)
        accr = select(_data[r - 1], accr);
    }
    return select(accl, accr);
  }
}

// ----------------------------------------------

void times(alias fun)(long n) {
  // n.iota.each!(i => fun());
  foreach (i; 0 .. n)
    fun();
}

auto rep(alias fun, T = typeof(fun()))(long n) {
  // return n.iota.map!(i => fun()).array;
  T[] res = new T[n];
  foreach (ref e; res)
    e = fun();
  return res;
}

T ceil(T)(T x, T y) if (isIntegral!T || is(T == BigInt)) {
  // `(x+y-1)/y` will only work for positive numbers ...
  T t = x / y;
  if (y > 0 && t * y < x)
    t++;
  if (y < 0 && t * y > x)
    t++;
  return t;
}

T floor(T)(T x, T y) if (isIntegral!T || is(T == BigInt)) {
  T t = x / y;
  if (y > 0 && t * y > x)
    t--;
  if (y < 0 && t * y < x)
    t--;
  return t;
}

ref T ch(alias fun, T, S...)(ref T lhs, S rhs) {
  return lhs = fun(lhs, rhs);
}

unittest {
  long x = 1000;
  x.ch!min(2000);
  assert(x == 1000);
  x.ch!min(3, 2, 1);
  assert(x == 1);
  x.ch!max(100).ch!min(1000); // clamp
  assert(x == 100);
  x.ch!max(0).ch!min(10); // clamp
  assert(x == 10);
}

mixin template Constructor() {
  import std.traits : FieldNameTuple;

  this(Args...)(Args args) {
    // static foreach(i, v; args) {
    foreach (i, v; args) {
      mixin("this." ~ FieldNameTuple!(typeof(this))[i]) = v;
    }
  }
}

template scanln(Args...) {
  enum sep = " ";

  enum n = () {
    long n = 0;
    foreach (Arg; Args) {
      static if (is(Arg == class) || is(Arg == struct) || is(Arg == union)) {
        n += Fields!Arg.length;
      } else {
        n++;
      }
    }
    return n;
  }();

  enum fmt = n.rep!(() => "%s").join(sep);

  enum argsString = () {
    string[] xs = [];
    foreach (i, Arg; Args) {
      static if (is(Arg == class) || is(Arg == struct) || is(Arg == union)) {
        foreach (T; FieldNameTuple!Arg) {
          xs ~= "&args[%d].%s".format(i, T);
        }
      } else {
        xs ~= "&args[%d]".format(i);
      }
    }
    return xs.join(", ");
  }();

  void scanln(auto ref Args args) {
    string line = readln.chomp;
    static if (__VERSION__ >= 2074) {
      mixin(
          "line.formattedRead!fmt(%s);".format(argsString)
      );
    } else {
      mixin(
          "line.formattedRead(fmt, %s);".format(argsString)
      );
    }
  }
}

// fold was added in D 2.071.0
static if (__VERSION__ < 2071) {
  template fold(fun...) if (fun.length >= 1) {
    auto fold(R, S...)(R r, S seed) {
      static if (S.length < 2) {
        return reduce!fun(seed, r);
      } else {
        return reduce!fun(tuple(seed), r);
      }
    }
  }
}

// popcnt with ulongs was added in D 2.071.0
static if (__VERSION__ < 2071) {
  ulong popcnt(ulong x) {
    x = (x & 0x5555555555555555L) + (x >> 1 & 0x5555555555555555L);
    x = (x & 0x3333333333333333L) + (x >> 2 & 0x3333333333333333L);
    x = (x & 0x0f0f0f0f0f0f0f0fL) + (x >> 4 & 0x0f0f0f0f0f0f0f0fL);
    x = (x & 0x00ff00ff00ff00ffL) + (x >> 8 & 0x00ff00ff00ff00ffL);
    x = (x & 0x0000ffff0000ffffL) + (x >> 16 & 0x0000ffff0000ffffL);
    x = (x & 0x00000000ffffffffL) + (x >> 32 & 0x00000000ffffffffL);
    return x;
  }
}


Measured memory_bytes: 37932