#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  for(int i=0;i<(n);++i)
#define FORq(i, m, n) for(int i = (m);i <= (n);++i)
#define SCD(n) scanf("%d",&n)
#define SCD2(m,n) scanf("%d%d",&m,&n)
#define SCD3(m,n,k) scanf("%d%d%d",&m,&n,&k)
#define PB push_back
#define MP make_pair
#define ARSCD(A,N) REP(i,N){SCD(A[i]);}
#define ARSCD1(A,N) FORq(i,1,N){SCD(A[i]);}
#define PRINTD(n) printf("%d\n",n)
#define PRINTLLD(n) printf("%lld\n",n)
#define DEBUG printf("%s\n","debug")
#define fst first
#define snd second
#define IN(x,S) (S.count(x) != 0)
using namespace std;
typedef pair<int,int> PII;
typedef vector<int> VI;
typedef long long ll;
//////////////////////////////////////////////////////
int main(){
	ll W,H,N;
	scanf("%lld %lld %lld",&W,&H,&N);
	
	set<int> xset;
	set<int> yset;
	ll ans = 0;
	
	FORq(i,1,N){
		int x,y;
		SCD2(x,y);
		
		xset.insert(x);
		yset.insert(y);
	}
	
	ll Ws = xset.size();
	ll Hs = yset.size();
	
	PRINTLLD(W*H-(W-Ws)*(H-Hs)-N);
	
	return 0;
}