#ifndef LOCAL
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#endif

#include <bits/stdc++.h>
using namespace std;

using ll=long long;
#define int ll

#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)
#define gnr(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define per(i,b) gnr(i,0,b)
#define pb push_back
#define eb emplace_back
#define a first
#define b second
#define bg begin()
#define ed end()
#define all(x) x.bg,x.ed
#define si(x) int(x.size())
#ifdef LOCAL
#define dmp(x) cerr<<__LINE__<<" "<<#x<<" "<<x<<endl
#else
#define dmp(x) void(0)
#endif

template<class t,class u> bool chmax(t&a,u b){if(a<b){a=b;return true;}else return false;}
template<class t,class u> bool chmin(t&a,u b){if(b<a){a=b;return true;}else return false;}

template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;

using pi=pair<int,int>;
using vi=vc<int>;

template<class t,class u>
ostream& operator<<(ostream& os,const pair<t,u>& p){
	return os<<"{"<<p.a<<","<<p.b<<"}";
}

template<class t> ostream& operator<<(ostream& os,const vc<t>& v){
	os<<"{";
	for(auto e:v)os<<e<<",";
	return os<<"}";
}

#define mp make_pair
#define mt make_tuple
#define one(x) memset(x,-1,sizeof(x))
#define zero(x) memset(x,0,sizeof(x))
#ifdef LOCAL
void dmpr(ostream&os){os<<endl;}
template<class T,class... Args>
void dmpr(ostream&os,const T&t,const Args&... args){
	os<<t<<" ";
	dmpr(os,args...);
}
#define dmp2(...) dmpr(cerr,__LINE__,##__VA_ARGS__)
#else
#define dmp2(...) void(0)
#endif

using uint=unsigned;
using ull=unsigned long long;

template<class t,size_t n>
ostream& operator<<(ostream&os,const array<t,n>&a){
	return os<<vc<t>(all(a));
}

template<int i,class T>
void print_tuple(ostream&,const T&){
}

template<int i,class T,class H,class ...Args>
void print_tuple(ostream&os,const T&t){
	if(i)os<<",";
	os<<get<i>(t);
	print_tuple<i+1,T,Args...>(os,t);
}

template<class ...Args>
ostream& operator<<(ostream&os,const tuple<Args...>&t){
	os<<"{";
	print_tuple<0,tuple<Args...>,Args...>(os,t);
	return os<<"}";
}

template<class t>
void print(t x,int suc=1){
	cout<<x;
	if(suc==1)
		cout<<"\n";
	if(suc==2)
		cout<<" ";
}

ll read(){
	ll i;
	cin>>i;
	return i;
}

vi readvi(int n,int off=0){
	vi v(n);
	rep(i,n)v[i]=read()+off;
	return v;
}

pi readpi(int off=0){
	int a,b;cin>>a>>b;
	return pi(a+off,b+off);
}

template<class t,class u>
void print(const pair<t,u>&p,int suc=1){
	print(p.a,2);
	print(p.b,suc);
}

template<class t,class u>
void print_offset(const pair<t,u>&p,ll off,int suc=1){
	print(p.a+off,2);
	print(p.b+off,suc);
}

template<class T>
void print(const vector<T>&v,int suc=1){
	rep(i,v.size())
		print(v[i],i==int(v.size())-1?suc:2);
}

template<class T>
void print_offset(const vector<T>&v,ll off,int suc=1){
	rep(i,v.size())
		print(v[i]+off,i==int(v.size())-1?suc:2);
}

template<class T,size_t N>
void print(const array<T,N>&v,int suc=1){
	rep(i,N)
		print(v[i],i==int(N)-1?suc:2);
}

string readString(){
	string s;
	cin>>s;
	return s;
}

template<class T>
T sq(const T& t){
	return t*t;
}

void YES(bool ex=true){
	cout<<"YES\n";
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}
void NO(bool ex=true){
	cout<<"NO\n";
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}
void Yes(bool ex=true){
	cout<<"Yes\n";
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}
void No(bool ex=true){
	cout<<"No\n";
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}
//#define CAPITAL
/*
void yes(bool ex=true){
	#ifdef CAPITAL
	cout<<"YES"<<"\n";
	#else
	cout<<"Yes"<<"\n";
	#endif
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}
void no(bool ex=true){
	#ifdef CAPITAL
	cout<<"NO"<<"\n";
	#else
	cout<<"No"<<"\n";
	#endif
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}*/
void possible(bool ex=true){
	#ifdef CAPITAL
	cout<<"POSSIBLE"<<"\n";
	#else
	cout<<"Possible"<<"\n";
	#endif
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}
void impossible(bool ex=true){
	#ifdef CAPITAL
	cout<<"IMPOSSIBLE"<<"\n";
	#else
	cout<<"Impossible"<<"\n";
	#endif
	if(ex)exit(0);
	#ifdef LOCAL
	cout.flush();
	#endif
}

constexpr ll ten(int n){
	return n==0?1:ten(n-1)*10;
}

const ll infLL=LLONG_MAX/3;

#ifdef int
const int inf=infLL;
#else
const int inf=INT_MAX/2-100;
#endif

int topbit(signed t){
	return t==0?-1:31-__builtin_clz(t);
}
int topbit(ll t){
	return t==0?-1:63-__builtin_clzll(t);
}
int botbit(signed a){
	return a==0?32:__builtin_ctz(a);
}
int botbit(ll a){
	return a==0?64:__builtin_ctzll(a);
}
int botbit(ull a){
	return a==0?64:__builtin_ctzll(a);
}
int popcount(signed t){
	return __builtin_popcount(t);
}
int popcount(ll t){
	return __builtin_popcountll(t);
}
int popcount(ull t){
	return __builtin_popcountll(t);
}
bool ispow2(int i){
	return i&&(i&-i)==i;
}
ll mask(int i){
	return (ll(1)<<i)-1;
}

bool inc(int a,int b,int c){
	return a<=b&&b<=c;
}

template<class t> void mkuni(vc<t>&v){
	sort(all(v));
	v.erase(unique(all(v)),v.ed);
}

ll rand_int(ll l, ll r) { //[l, r]
	#ifdef LOCAL
	static mt19937_64 gen;
	#else
	static mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());
	#endif
	return uniform_int_distribution<ll>(l, r)(gen);
}

template<class t>
void myshuffle(vc<t>&a){
	rep(i,si(a))swap(a[i],a[rand_int(0,i)]);
}

template<class t>
int lwb(const vc<t>&v,const t&a){
	return lower_bound(all(v),a)-v.bg;
}

vvc<int> readGraph(int n,int m){
	vvc<int> g(n);
	rep(i,m){
		int a,b;
		cin>>a>>b;
		//sc.read(a,b);
		a--;b--;
		g[a].pb(b);
		g[b].pb(a);
	}
	return g;
}

vvc<int> readTree(int n){
	return readGraph(n,n-1);
}

vc<ll> presum(const vi&a){
	vc<ll> s(si(a)+1);
	rep(i,si(a))s[i+1]=s[i]+a[i];
	return s;
}

//軽量
template<class t>
struct scc{
	const int n;
	const vvc<t>&g;
	vi ord,low,bl,st;
	int s,head;
	void dfs(int v){
		ord[v]=low[v]=head++;
		st.pb(v);
		for(auto to:g[v]){
			if(ord[to]==-1){
				dfs(to);
				chmin(low[v],low[to]);
			}else if(bl[to]==-1)
				chmin(low[v],ord[to]);
		}
		if(ord[v]==low[v]){
			int c=s++;
			while(1){
				int a=st.back();
				st.pop_back();
				bl[a]=c;
				if(v==a)break;
			}
		}
	}
	scc(const vvc<t>&gg):n(gg.size()),g(gg),
		ord(n,-1),low(n,-1),bl(n,-1),s(0),head(0){
		rep(i,n)if(ord[i]==-1)
			dfs(i);
		rep(i,n)
			bl[i]=s-1-bl[i];
	}
};

struct N{
	const vc<pi>&xy;
	int head,sum;
	N(const vc<pi>&ini):xy(ini),head(0),sum(0){}
	int sub(int x,int y){
		assert(xy[head].a<=x);
		assert(xy[head].b<=y);
		if(head+1<si(xy)){
			chmin(x,xy[head+1].a);
			chmin(y,xy[head+1].b);
			return (x-xy[head].a)*(y-xy[head].b);
		}else return 0;
	}
	int getarea(int x,int y){
		while(head+1<si(xy)&&xy[head+1].a<=x&&xy[head+1].b<=y){
			sum+=sub(inf,inf);
			head++;
		}
		return sum+sub(x,y);
	}
};

void slv(){
	vi ns=readvi(3);
	int m;cin>>m;
	int n=accumulate(all(ns),2);
	vi vs[3];
	{
		int used=0;
		rep(k,3){
			vs[k].pb(n-2);
			rep(_,ns[k])vs[k].pb(used++);
			vs[k].pb(n-1);
		}
	}
	vvc<int> g(n);
	rep(k,3)rep(i,si(vs[k])-1)g[vs[k][i]].pb(vs[k][i+1]);
	vc<pi> es;
	rep(_,m){
		int a,b;cin>>a>>b;
		a--;b--;
		if(a>b)swap(a,b);
		g[a].pb(b);
		g[b].pb(a);
		es.eb(a,b);
	}
	scc<int> s(g);
	vc<pi> tp(n);
	vi len(3);
	rep(k,3){
		int pre=-1;
		for(auto v:vs[k]){
			if(s.bl[v]!=pre)len[k]++;
			pre=s.bl[v];
			tp[v]=pi(k,len[k]-1);
		}
	}
	vi mx[2],mn[2];
	rep(k,2){
		mx[k].resize(len[2],0);
		mn[k].resize(len[2],len[k]-1);
	}
	vc<pi> xy{pi(0,0),pi(len[0]-1,len[1]-1)};
	for(auto [a,b]:es){
		if(tp[a].a==tp[b].a)continue;
		if(tp[b].a<2){
			assert(tp[a].a==0);
			assert(tp[b].a==1);
			xy.eb(tp[a].b,tp[b].b);
		}else{
			assert(tp[a].a==0||tp[a].a==1);
			auto [k,i]=tp[a];
			chmax(mx[k][tp[b].b],i);
			chmin(mn[k][tp[b].b],i);
		}
	}
	mkuni(xy);
	N RU(xy),RD(xy),LU(xy),LD(xy);
	rep(k,2){
		rep(i,len[2]-1)chmax(mx[k][i+1],mx[k][i]);
		per(i,len[2]-1)chmin(mn[k][i],mn[k][i+1]);
	}
	int ans=0;
	rep(i,len[2]-1){
		int l=mx[0][i],r=mn[0][i+1];
		int d=mx[1][i],u=mn[1][i+1];
		
		ans+=RU.getarea(r,u);
		ans-=RD.getarea(r,d);
		ans-=LU.getarea(l,u);
		ans+=LD.getarea(l,d);
	}
	print(ans);
}

signed main(){
	cin.tie(0);
	ios::sync_with_stdio(0);
	cout<<fixed<<setprecision(20);
	
	//int t;cin>>t;rep(_,t)
	slv();
}