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*/

#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <functional>
#include <set>
#include <ctime>
#include <random>
#include <chrono>
#include <cassert>
using namespace std;

namespace {
  using Integer = long long; //__int128;
  template<class T> istream& operator >> (istream& is, vector<T>& vec){for(T& val: vec) is >> val; return is;}
  template<class T> istream& operator ,  (istream& is, T& val){ return is >> val;}
  template<class T> ostream& operator << (ostream& os, const vector<T>& vec){for(int i=0; i<vec.size(); i++) os << vec[i] << (i==vec.size()-1?"":" "); return os;}
  template<class T> ostream& operator ,  (ostream& os, const T& val){ return os << " " << val;}

  template<class H> void print(const H& head){ cout << head; }
  template<class H, class ... T> void print(const H& head, const T& ... tail){ cout << head << " "; print(tail...); }
  template<class ... T> void println(const T& ... values){ print(values...); cout << endl; }

  template<class H> void eprint(const H& head){ cerr << head; }
  template<class H, class ... T> void eprint(const H& head, const T& ... tail){ cerr << head << " "; eprint(tail...); }
  template<class ... T> void eprintln(const T& ... values){ eprint(values...); cerr << endl; }

  class range{
    long long start_, end_, step_;
   public:
    struct range_iterator{
      long long val, step_;
      range_iterator(long long v, long long step) : val(v), step_(step) {}
      long long operator * (){return val;}
      void operator ++ (){val += step_;}
      bool operator != (range_iterator& x){return step_ > 0 ? val < x.val : val > x.val;}
    };
    range(long long len) : start_(0), end_(len), step_(1) {}
    range(long long start, long long end) : start_(start), end_(end), step_(1) {}
    range(long long start, long long end, long long step) : start_(start), end_(end), step_(step) {}
    range_iterator begin(){ return range_iterator(start_, step_); }
    range_iterator   end(){ return range_iterator(  end_, step_); }
  };

  string operator "" _s (const char* str, size_t size){ return move(string(str)); }
  constexpr Integer my_pow(Integer x, Integer k, Integer z=1){return k==0 ? z : k==1 ? z*x : (k&1) ? my_pow(x*x,k>>1,z*x) : my_pow(x*x,k>>1,z);}
  constexpr Integer my_pow_mod(Integer x, Integer k, Integer M, Integer z=1){return k==0 ? z%M : k==1 ? z*x%M : (k&1) ? my_pow_mod(x*x%M,k>>1,M,z*x%M) : my_pow_mod(x*x%M,k>>1,M,z);}
  constexpr unsigned long long operator "" _ten (unsigned long long value){ return my_pow(10,value); }

  inline int k_bit(Integer x, int k){return (x>>k)&1;} //0-indexed

  mt19937 mt(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count());

  template<class T> string join(const vector<T>& v, const string& sep){
    stringstream ss; for(int i=0; i<v.size(); i++){ if(i>0) ss << sep; ss << v[i]; } return ss.str();
  }

  string operator * (string s, int k){ string ret; while(k){ if(k&1) ret += s; s += s; k >>= 1; } return ret; }

}


template<class T>
class SparseTable{
 public:
  SparseTable(vector<T>& vec, T default_value_, function<T(T,T)> eval)
   : col(vec.size()), default_value(default_value_)
  {
    evaluate = eval;

    row = 1;
    while((1<<row) < col) row += 1;
    row++;
    table = vector<vector<int>>(row, vector<int>(col));

    set(vec);
  }

  void set(vector<T>& vec){
    assert(col == vec.size());

    values = &vec;
    vector<T>& val = vec;

    iota(table[0].begin(), table[0].end(), 0);
    for(int k=1; k<row; k++){
      for(int i=0; i + (1<<k)-1 < col; i++){
        auto left = val[table[k-1][i]];
        auto right = val[table[k-1][i+(1<<(k-1))]];
        if(left == evaluate(left,right)){
          table[k][i] = table[k-1][i];
        }else{
          table[k][i] = table[k-1][i+(1<<(k-1))];
        }
      }
    }
  }

  //[l,r)
  T get(int l, int r){
    if(l>=r) return default_value;
    vector<T>& val = *values;

    T ret = default_value;

    int k = 0;
    while((1<<(k+1)) < (r-l)) k++;

    auto left  = val[ table[k][l] ];
    auto right = val[ table[k][r-(1<<k)] ];

    ret = evaluate(left, right);
    return ret;
  }

 private:
  int col;
  int row;
  T default_value;
  vector<T>* values;
  vector<vector<int>> table;

  function<T(T,T)> evaluate;
};


int main(){
  int n;
  scanf("%d", &n);
  vector<vector<int>> G(n+1);
  G[0].push_back(1);
  G[1].push_back(0);
  for(int _ : range(n-1)){
    int u,v;
    scanf("%d%d", &u, &v);
    G[u].push_back(v);
    G[v].push_back(u);
  }

  vector<int> parent(n+1, 0);
  vector<int> depth (n+1, 0);
  vector<int> a(n+1, 0);
  vector<pair<int,int>> b;

  function<void(int,int)> EulerTour = [&](int pos, int last){
    parent[pos] = last;
    depth[pos] = depth[last] + 1;
    a[pos] = b.size();
    b.push_back({depth[pos], pos});

    for(int nx : G[pos]){
      if(nx == last) continue;
      EulerTour(nx, pos);

      b.push_back({depth[pos], pos});
    }
  };

  EulerTour(1, 0);

  SparseTable< pair<int,int> > t(b, {8_ten, 8_ten}, [&](pair<int,int> a, pair<int,int> b){return a<b ? a : b;});

  vector<long long> s(n+1, 0);
  vector<vector<int>> d( *max_element(depth.begin(), depth.end()) + 1 );

  for(int v : range(1, n+1)){
    d[ depth[v] ].push_back( v );
  }

  int q;
  scanf("%d", &q);
  while(q--){
    int u,v;
    scanf("%d%d", &u, &v);

    int p = t.get( min(a[u], a[v]), max(a[u], a[v]) ).second;

    s[u]++;
    s[v]++;
    s[p]--;
    s[ parent[p] ]--;
  }

  long long ans = 0;
  for(int dd=d.size()-1; dd>0; dd--){
    for(int v : d[dd]){
      ans += s[v] * (s[v] + 1) / 2;
      s[ parent[v] ] += s[v];
    }
  }

  println(ans);
  return 0;
}