#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for (int i=0; i<(n); ++i)
#define FOR(i, a, n) for (int i=(a); i<(n); ++i)

#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(),(x).end()

#define DUMP(x) cerr<<#x<<" = "<<(x)<<endl
#define DEBUG(x) cerr<<#x<<" = "<<(x)<<" (L"<<__LINE__<<")"<<endl;

template<class T>
ostream &operator<<(ostream &os, const vector <T> &v) {
  os << "[";
  REP(i, SZ(v)) {
    if (i) os << ", ";
    os << v[i];
  }
  return os << "]";
}

template<class T, class U>
ostream &operator<<(ostream &os, const pair <T, U> &p) {
  return os << "(" << p.first << " " << p.second << ")";
}

template<class T>
bool chmax(T &a, const T &b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

template<class T>
bool chmin(T &a, const T &b) {
  if (b < a) {
    a = b;
    return true;
  }
  return false;
}

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using P = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;
using vvi = vector<vi>;
using vvll = vector<vll>;

const ll MOD = 1e9 + 7;
const int INF = INT_MAX / 2;
const ll LINF = LLONG_MAX / 2;
const ld eps = 1e-9;

struct UnionFind
{
  vector<int> par, sz;
  UnionFind(int n) : par(n), sz(n, 1) {
    for (int i = 0; i < n; ++i) par[i] = i;
  }
  int root(int x) {
    if (par[x] == x) return x;
    return par[x] = root(par[x]);
  }
  void merge(int x, int y) {
    x = root(x);
    y = root(y);
    if (x == y) return;
    if (sz[x] < sz[y]) swap(x, y);
    par[y] = x;
    sz[x] += sz[y];
    sz[y] = 0;
  }
  bool issame(int x, int y) {
    return root(x) == root(y);
  }
  int size(int x) {
    return sz[root(x)];
  }
};

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(10);

  int n, d, w; cin >> n >> d >> w;

  UnionFind uf1(n);
  UnionFind uf2(n);

  REP(i, d) {
    int u, v; cin >> u >> v;
    u--; v--;
    uf1.merge(u, v);
  }

  REP(i, w) {
    int u, v; cin >> u >> v;
    u--; v--;
    uf2.merge(u, v);
  }

  map<int, ll> mp1, mp2;
  REP(i, n) {
    mp1[uf1.root(i)]++;
    mp2[uf2.root(i)]++;
  }

  set<P> ans;
  REP(i, n) {
    ans.insert({uf1.root(i), uf2.root(i)});
  }

  ll cnt = 0;
  for(auto &e: ans) {
    cnt += mp1[e.first] * mp2[e.second];
  }
  cout << cnt - n << endl;

  return 0;
}