#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000000000000

struct unionfind{
	vector<int> data;
	vector<int> size;
	unionfind(int n){
		for(int i=0;i<n;i++){
			data.push_back(i);
			size.push_back(1);
		}
	}
	
	int find(int x){
		if(data[x]==x)return x;
		return data[x]=find(data[x]);
	}
	
	bool unite(int x,int y){
		x=find(x);y=find(y);
		if(x==y)return false;
		if(size[x]>size[y])swap(x,y);
		data[x]=y;
		size[y]+=size[x];
		return true;
	}
	
	bool check(int x,int y){
		return (find(x)==find(y));
	}
	
	int get_size(int x){
		int X = find(x);
		return size[X];
	}
};

int main(){
	
	int N,Md,Mw;
	cin>>N>>Md>>Mw;
	
	unionfind uf1(N),uf2(N);
	
	for(int i=0;i<Md;i++){
		int a,b;
		scanf("%d %d",&a,&b);
		a--;b--;
		uf1.unite(a,b);
	}
	
	for(int i=0;i<Mw;i++){
		int a,b;
		scanf("%d %d",&a,&b);
		a--;b--;
		uf2.unite(a,b);
	}
	
	vector<set<int>> S(N);
	
	for(int i=0;i<N;i++){
		S[uf1.find(i)].insert(uf2.find(i));
	}
	
	vector<long long> cnt(N,0);
	for(int i=0;i<N;i++){
		for(auto a:S[i]){
			cnt[i] += (long long)uf2.get_size(a);
		}
	}
	
	long long ans = 0;
	
	for(int i=0;i<N;i++){
		ans += cnt[uf1.find(i)]-1;
	}
	cout<<ans<<endl;
	
	return 0;
}