#include "bits/stdc++.h"

using namespace std;

#define ll long long
#define vi  vector<int>
#define vvi vector<vi>
#define pi  pair<int,int>
#define mp  make_pair
#define pb  push_back
#define MOD 1e9 + 7
#define PAI  3.1415
#define all(x) (x).begin(),(x).end()
#define chmax(x,y) x = max(x,y)
#define chmin(x,y) x = min(x,y)
#define pr(x) cout << x << endl
#define Endl endl
#define rep(i,n) for(int i = 0 ; i < n; i++)

const int dx[4] = {1,0,-1,0};
const int dy[4] = {0,1,0,-1};
const int ddx[8] = {-1,0,1,-1,1,-1,0,1};
const int ddy[8] = {-1,-1,-1,0,0,1,1,1};
const int inf = 99999999;
const ll linf = 1LL << 62;

ll gcd(ll a,ll b){
  if(a < b)swap(a , b);
  if(a % b == 0) return b;
  else gcd(b, a%b);
}

ll lcm(ll a,ll b){
  if(a < b)swap(a , b);
  return (a/gcd(a , b)) * b;
}

int main(){
 
  ll w, h, n; cin >> w >> h >> n;
  vector<ll > vll(w + 10);
  set<ll> col, num;

  for(int i = 0; i < n; i++)
  {
    ll s, k; cin >> s >> k;
    vll[s]++;
    col.insert(s);
    num.insert(k);
  }

  ll ans = 0;

  for(ll i = 1; i <= w; i++)
  {
    if(vll[i] != 0)
      ans += h - vll[i];
  }
  ans += (w - col.size()) * num.size();
  
  pr(ans);

  return 0;
}