#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, D, W;
  cin >> N >> D >> W;
  vector<vector<int>> E1(N);
  for (int i = 0; i < D; i++){
    int a, b;
    cin >> a >> b;
    a--;
    b--;
    E1[a].push_back(b);
    E1[b].push_back(a);
  }
  vector<vector<int>> E2(N);
  for (int i = 0; i < W; i++){
    int c, d;
    cin >> c >> d;
    c--;
    d--;
    E2[c].push_back(d);
    E2[d].push_back(c);
  }
  vector<int> c1(N, -1);
  int cnt1 = 0;
  for (int i = 0; i < N; i++){
    if (c1[i] == -1){
      c1[i] = cnt1;
      queue<int> Q;
      Q.push(i);
      while (!Q.empty()){
        int v = Q.front();
        Q.pop();
        for (int w : E1[v]){
          if (c1[w] == -1){
            c1[w] = cnt1;
            Q.push(w);
          }
        }
      }
      cnt1++;
    }
  }
  vector<int> c2(N, -1);
  int cnt2 = 0;
  vector<int> sz;
  for (int i = 0; i < N; i++){
    if (c2[i] == -1){
      c2[i] = cnt2;
      int cnt = 1;
      queue<int> Q;
      Q.push(i);
      while (!Q.empty()){
        int v = Q.front();
        Q.pop();
        for (int w : E2[v]){
          if (c2[w] == -1){
            c2[w] = cnt2;
            cnt++;
            Q.push(w);
          }
        }
      }
      sz.push_back(cnt);
      cnt2++;
    }
  }
  vector<set<int>> st(cnt1);
  for (int i = 0; i < N; i++){
    st[c1[i]].insert(c2[i]);
  }
  vector<int> ans(cnt1, 0);
  for (int i = 0; i < cnt1; i++){
    for (int j : st[i]){
      ans[i] += sz[j];
    }
  }
  long long sum = 0;
  for (int i = 0; i < N; i++){
    sum += ans[c1[i]];
  }
  sum -= N;
  cout << sum << endl;
}