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

template <typename T, typename U> bool cmin(T &a, U b) { return a > b && (a = b, true); }
template <typename T, typename U> bool cmax(T &a, U b) { return a < b && (a = b, true); }

class UnionFind {
private:
  long N;
  vector<long> PS;

public:
  UnionFind() : N(0) {}
  UnionFind(long n) : N(n), PS(n, -1) {}
  bool unite(long a, long b) {
    long x = root(a), y = root(b);
    if (x == y) return false;
    if (-PS.at(x) < -PS.at(y)) swap(x, y);
    PS.at(x) += PS.at(y);
    PS.at(y) = x;
    return true;
  }
  bool same(long a, long b) { return root(a) == root(b); }
  long root(long a) {
    if (PS.at(a) < 0) return a;
    return PS.at(a) = root(PS.at(a));
  }
  long size(long a) { return -PS.at(root(a)); }
  vector<vector<long>> groups() {
    vector<long> B(N), S(N);
    for (long i = 0; i < N; i++) {
      B.at(i) = root(i);
      S.at(B.at(i))++;
    }
    vector<vector<long>> ret(N);
    for (long i = 0; i < N; i++) {
      ret.at(i).reserve(S.at(i));
    }
    for (long i = 0; i < N; i++) {
      ret.at(B.at(i)).push_back(i);
    }
    auto f = [&](const vector<long> &v) { return v.empty(); };
    ret.erase(remove_if(ret.begin(), ret.end(), f), ret.end());
    return ret;
  }
};

signed main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);

  long N, D, W;
  cin >> N >> D >> W;

  vector<pair<long, long>> AB(D);
  for (long i = 0; i < D; i++) cin >> AB.at(i).first >> AB.at(i).second;

  vector<pair<long, long>> CD(W);
  for (long i = 0; i < W; i++) cin >> CD.at(i).first >> CD.at(i).second;

  UnionFind UF(N);
  UnionFind UF2(N);

  for (auto [a, b] : AB) {
    a--, b--;
    UF.unite(a, b);
  }
  vector<set<long>> V(N);
  for (long i = 0; i < N; i++) {
    V.at(UF.root(i)).insert(i);
  }

  for (auto [a, b] : CD) {
    a--, b--;
    UF2.unite(a, b);
  }
  vector<set<long>> V2(N);
  for (long i = 0; i < N; i++) {
    V2.at(UF2.root(i)).insert(i);
  }

  long ans = 0;
  vector<long> tmp(N, -1);
  for (long i = 0; i < N; i++) {
    if (tmp.at(UF.root(i)) != -1) {
      ans += tmp.at(UF.root(i));
      continue;
    }
    set<long> SE;
    vector<long> tmp2(N);
    for (auto a : V.at(UF.root(i))) {
      if (tmp2.at(UF2.root(a))) continue;
      for (auto b : V2.at(UF2.root(a))) SE.insert(b);
      tmp2.at(UF2.root(a)) = 1;
    }
    ans += SE.size() - 1;
    tmp.at(UF.root(i)) = SE.size() - 1;
  }
  cout << ans << "\n";
}