#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define maxs(x,y) (x = max(x,y))
#define mins(x,y) (x = min(x,y))
#define limit(x,l,r) max(l,min(x,r))
#define lims(x,l,r) (x = max(l,min(x,r)))
#define isin(x,l,r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)),x.end())
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define show(x) cout<<#x<<" = "<<x<<endl;
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define bn(x) ((1<<x)-1)
#define dup(x,y) (((x)+(y)-1)/(y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
inline int in() { int x; scanf("%d",&x); return x;}
template<typename T>inline istream& operator>>(istream&i,v(T)&v)
{rep(j,sz(v))i>>v[j];return i;}
template<typename T>string join(const v(T)&v)
{stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}
template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v)
{if(sz(v))o<<join(v);return o;}
template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v)
{return i>>v.fi>>v.se;}
template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v)
{return o<<v.fi<<","<<v.se;}
template<typename T>inline ll suma(const v(T)& a) { ll res(0); for (auto&& x : a) res += x; return res;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("-1"); return 0;}
#define yn {puts("YES");}else{puts("NO");}
int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0};
//////////////////////////////////////////////////
//

struct edge {
    int to, id;
    edge(int to, int id): to(to), id(id) {}
};

vector<edge> g[55];

vector<int> es;
bool dfs(int v, int tv, int p=-1) {
    if (v == tv) return true;
    for (edge e : g[v]) {
        if (e.to == p) continue;
        if (dfs(e.to, tv, v)) {
            es.push_back(e.id);
            return true;
        }
    }
    return false;
}

int main() {
    int n, m;
    cin >> n;
    rep(i, n-1) {
        int a, b;
        cin >> a >> b;
        --a; --b;
        g[a].emplace_back(b, i);
        g[b].emplace_back(a, i);
    }

    cin >> m;
    vl eset(m);
    rep(i, m) {
        int a, b;
        cin >> a >> b;
        --a; --b;
        es = vector<int>();
        dfs(a, b);
        for (int e: es)
            eset[i] |= 1ll<<e;
    }
    ll ans = 0;
    rep(i, 1<<m) {
        ll mask = 0;
        rep(j, m) {
            if (i>>j&1) mask |= eset[j];
        }
        int white = pcnt(mask);
        ll now = 1ll<<(n-1-white);
        if (__builtin_popcountll(i) % 2 == 0) ans += now;
        else ans -= now;
    }
    cout << ans << endl;
    return 0;
}


Measured memory_bytes: 256