#include <bits/stdc++.h>
#define FOR(v, a, b) for(int v = (a); v < (b); ++v)
#define FORE(v, a, b) for(int v = (a); v <= (b); ++v)
#define REP(v, n) FOR(v, 0, n)
#define REPE(v, n) FORE(v, 0, n)
#define REV(v, a, b) for(int v = (a); v >= (b); --v)
#define ALL(x) (x).begin(), (x).end()
#define ITR(it, c) for(auto it = (c).begin(); it != (c).end(); ++it)
#define RITR(it, c) for(auto it = (c).rbegin(); it != (c).rend(); ++it)
#define EXIST(c,x) ((c).find(x) != (c).end())
#define LLI long long int
#define fst first
#define snd second
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef M_E
#define M_E 2.71828182845904523536
#endif

#ifdef DEBUG
#include <misc/C++/Debug.cpp>
#else
#define dump(x)
#endif

#define pln(x) cout << (x) << endl
#define gcd __gcd

using namespace std;
template <class T> constexpr T lcm(T m, T n){return m/gcd(m,n)*n;}

template <typename T> using V = vector<T>;
template <typename T, typename U> using P = pair<T,U>;
template <typename I> void join(ostream &ost, I s, I t, string d=" "){for(auto i=s; i!=t; ++i){if(i!=s)ost<<d; ost<<*i;}ost<<endl;}
template <typename T> istream& operator>>(istream &is, vector<T> &v){for(auto &a : v) is >> a; return is;}
template <typename T, typename U> istream& operator>>(istream &is, pair<T,U> &p){is >> p.first >> p.second; return is;}

template <typename T, typename U> T& chmin(T &a, const U &b){return a = (a<=b?a:b);}
template <typename T, typename U> T& chmax(T &a, const U &b){return a = (a>=b?a:b);}
template <typename T, size_t N, typename U> void fill_array(T (&a)[N], const U &v){fill((U*)a, (U*)(a+N), v);}


template <typename Cost = int> class Edge{
public:
  int from,to;
  Cost cost;
  Edge() {}
  Edge(int to, Cost cost): to(to), cost(cost){}
  Edge(int from, int to, Cost cost): from(from), to(to), cost(cost){}

  Edge rev(){return Edge(to,from,cost);}
  
  static bool cmp_to_lt(const Edge &e1, const Edge &e2){return e1.to < e2.to;}
  static bool cmp_cost_lt(const Edge &e1, const Edge &e2){return e1.cost < e2.cost;}
  static bool cmp_to_gt(const Edge &e1, const Edge &e2){return e1.to > e2.to;}
  static bool cmp_cost_gt(const Edge &e1, const Edge &e2){return e1.cost > e2.cost;}
  friend ostream& operator<<(ostream &os, const Edge &e){
    os << "(FROM: " << e.from << "," << "TO: " << e.to << "," << "COST: " << e.cost << ")";
    return os;
  }
};

template <typename T> using Tree = vector<vector<Edge<T>>>;

template <typename T, typename U> class RangeRangeSegmentTree{
  int size;
  T e1;
  vector<T> vec1;
  function<T(T,T)> f1;
  U e2;
  vector<U> vec2;
  function<U(U,U)> f2;
  function<T(U,T,int)> g;

  void propagate(int i, int l){
    if(vec2[i] == e2) return;
    if(i < size/2){
      vec2[i*2+1] = f2(vec2[i], vec2[i*2+1]);
      vec2[i*2+2] = f2(vec2[i], vec2[i*2+2]);
    }
    vec1[i] = g(vec1[i], vec2[i], l);
    vec2[i] = e2;
  }

  T update_aux(int i, int l, int r, int s, int t, const U &x){
    propagate(i,r-l);
    if(r <= s || t <= l) return vec1[i];
    else if(s <= l && r <= t){
      vec2[i] = f2(vec2[i],x);
      propagate(i,r-l);
      return vec1[i];
    }
    else return vec1[i] = f1(update_aux(i*2+1,l,(l+r)/2,s,t,x), update_aux(i*2+2,(l+r)/2,r,s,t,x));
  }
  
  T query_aux(int i, int l, int r, int x, int y){
    propagate(i,r-l);
    if(r <= x || y <= l) return e1;
    else if(x <= l && r <= y) return vec1[i];
    else return f1(query_aux(i*2+1,l,(l+r)/2,x,y), query_aux(i*2+2,(l+r)/2,r,x,y));
  }
  
public:
  RangeRangeSegmentTree(){}
  RangeRangeSegmentTree(int n, const T &e1, const function<T(T,T)> f1, const U &e2, const function<U(U,U)> f2, const function<T(T,U,int)> g):
    e1(e1), f1(f1), e2(e2), f2(f2), g(g){
    size = 1;
    while(size<n) size*=2;
    size *= 2;
    size -= 1;

    vec1 = vector<T>(size,e1);
    vec2 = vector<U>(size,e2);
  }

  void update(int s, int t, const U &x){
    update_aux(0,0,size/2+1,s,t,x);
  }
  
  T query(int x, int y){
    return query_aux(0,0,size/2+1,x,y);
  }
};



template <typename T> class HLDecomposition{
  Tree<T> tree;
  int n;

  vector<int> sub, par, head, id, rid, next;

  int dfs_sub(int cur, int p){
    par[cur] = p;
    int t = 0;
    for(auto &e : tree[cur]){
      if(e.to == p) continue;
      sub[cur] += dfs_sub(e.to, cur);
      if(sub[e.to] > t){
	t = sub[e.to];
	next[cur] = e.to;
	swap(e, tree[cur][0]);
      }
    }
    return sub[cur];
  }

  void dfs_build(int cur, int &i){
    id[cur] = i;
    rid[i] = cur;
    ++i;

    for(auto &e : tree[cur]){
      if(e.to == par[cur]) continue;
      head[e.to] = (e.to == tree[cur][0].to ? head[cur] : e.to);
      dfs_build(e.to, i);
    }
  }
  

public:
  HLDecomposition(const Tree<T> &tree):
    tree(tree), n(tree.size()), sub(n,1), par(n,-1), head(n), id(n), rid(n), next(n,-1){
    dfs_sub(0, -1);
    int i=0;
    dfs_build(0, i);
  }

  void path_query_vertex(int x, int y, const function<void(int,int)> &f){
    while(1){
      if(id[x] > id[y]) swap(x, y);
      f(max(id[head[y]], id[x]), id[y]);
      if(head[x] == head[y]) return;
      y = par[head[y]];
    }
  }

};




int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N;
  while(cin >> N){
    Tree<int> tree(N);
    REP(i,N-1){
      int u,v; cin >> u >> v; --u, --v;
      tree[u].push_back(Edge<int>(u,v,1));
      tree[v].push_back(Edge<int>(v,u,1));
    }

    auto f = [](LLI a, LLI b){return a+b;};
    auto g = [](LLI a, LLI b, int l){return a+b*l;};

    HLDecomposition<int> hld(tree);
    RangeRangeSegmentTree<LLI,LLI> seg(N, 0, f, 0, f, g);
    seg.update(0,N,1);

    int Q; cin >> Q;
    LLI ans = 0;
    REP(i,Q){
      int A,B; cin >> A >> B; --A, --B;

      auto h = [&](int x, int y){
		 ans += seg.query(x,y+1);
		 seg.update(x,y+1,1);
	       };

      hld.path_query_vertex(A, B, h);
    }
    cout << ans << endl;
  }
  
  return 0;
}