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

//**************************************************************
//	link-cut tree
//**************************************************************
struct node {
	node *parent = nullptr;
	node *lch = nullptr;
	node *rch = nullptr;
	bool reversed = false;

	int size = 1;

	long long sum = 1;
	long long val = 1;
	long long lazy = 0;
};

int size(node *x) {
	if (x == nullptr) return 0;
	return x->size;
}

long long sum(node *x) {
	if (x == nullptr) return 0;
	return x->sum;
}

void update(node *x) {
	if (x == nullptr) return;
	x->size = 1 + size(x->lch) + size(x->rch);
	x->sum = x->val + sum(x->lch) + sum(x->rch);
}

void push(node *x) {
	if (x == nullptr) return;
	if (x->lazy == 0 && !x->reversed) return; 
	for (node *y : { x->lch, x->rch }) if (y != nullptr) {
		y->reversed ^= x->reversed;
		y->sum += x->lazy * size(y);
		y->lazy += x->lazy;
	}
	if (x->reversed) swap(x->lch, x->rch);
	x->reversed = false;
	x->val += x->lazy;
	x->lazy = 0;

	update(x);
}

//**************************************************************
//	link-cut tree basic operation
//**************************************************************
enum { LEFT, RIGHT };

bool is_root(node *x) {
	return x->parent == nullptr || (x->parent->lch != x && x->parent->rch != x);
}

int parent_direction(node *x) {
	if (is_root(x)) return -1;
	return x->parent->rch == x ? LEFT : RIGHT;
}

void connect(node *child, node *parent, int dir) {
	if (parent != nullptr && dir != -1) {
		(dir == RIGHT ? parent->lch : parent->rch) = child;
		update(parent);
	}
	if (child != nullptr) child->parent = parent;
}

void raise(node *x) {
	node *y = x->parent;
	node *z = y->parent;
	int xdir = parent_direction(x);
	int ydir = parent_direction(y);
	connect(xdir == LEFT ? x->lch : x->rch, y, xdir);
	connect(y, x, xdir ^ 1);
	connect(x, z, ydir);
}

void splay(node *x) {
	push(x);
	while (!is_root(x)) {
		push(x->parent->parent);
		push(x->parent);
		push(x);
		if (is_root(x->parent)) {
			raise(x);
		} else if (parent_direction(x) == parent_direction(x->parent)) {
			raise(x->parent);
			raise(x);
		} else {
			raise(x);
			raise(x);
		}
	}
	update(x);
}

void expose(node *x) {
	node *rch = nullptr;
	for (node *y = x; y != nullptr; y = y->parent) {
		splay(y);
		y->rch = rch;
		rch = y;
		update(y);
	}
	splay(x);
}

void cut(node *x) {
	expose(x);
	x->lch->parent = nullptr;
	x->lch = nullptr;
	update(x);
}

void link(node *x, node *p) {
	expose(x);
	expose(p);
	connect(x, p, LEFT);
}

void evert(node *x) {
	expose(x);
	x->reversed = true;
}

int main() {
	int n;
	cin >> n;

	vector<node *> tr(n);
	for (int i = 0; i < n; i++) tr[i] = new node();

	for (int i = 0; i < n - 1; i++) {
		int u, v;
		scanf("%d %d", &u, &v);
		u--;
		v--;
		evert(tr[v]);
		link(tr[v], tr[u]);
	}

	long long ans = 0;

	int Q;
	cin >> Q;
	for (int ii = 0; ii < Q; ii++) {
		int u, v;
		scanf("%d %d", &u, &v);
		u--;
		v--;
		evert(tr[u]);
		expose(tr[v]);
		ans += sum(tr[v]);
		tr[v]->lazy++;
	}
	cout << ans << endl;
}