#include <bits/stdc++.h>
using namespace std;
int n, m, l;
vector<vector<int>> adj;
int timer;
vector<int> tin, tout;
vector<vector<int>> up;
vector<int> dist;
vector<int> down;
void dfs(int v, int p) {
  dist[v] = dist[p] + 1;
  down[v] = 1;
  tin[v] = ++timer;
  up[v][0] = p;
  for (int i = 1; i <= l; ++i) up[v][i] = up[up[v][i - 1]][i - 1];
  for (int u : adj[v]) {
    if (u != p) {
      dfs(u, v);
      down[v] += down[u];
    }
  }
  tout[v] = ++timer;
}
bool is_ancestor(int u, int v) {
  return tin[u] <= tin[v] && tout[u] >= tout[v];
}
int lca(int u, int v) {
  if (is_ancestor(u, v)) return u;
  if (is_ancestor(v, u)) return v;
  for (int i = l; i >= 0; --i) {
    if (!is_ancestor(up[u][i], v)) u = up[u][i];
  }
  return up[u][0];
}
int pre(int u, int v) {
  for (int i = l; i >= 0; --i) {
    if (!is_ancestor(up[u][i], v)) u = up[u][i];
  }
  return u;
}
void preprocess(int root) {
  tin.resize(n + 1);
  tout.resize(n + 1);
  timer = 0;
  l = ceil(log2(n + 1));
  up.assign(n + 1, vector<int>(l + 2));
  dfs(root, root);
}
void trav(int x, int d) {
  int to = x;
  for (int i = l; i >= 0; i--) {
    if (dist[x] - dist[up[to][i]] < d) {
      to = up[to][i];
    }
  }
  cout << down[up[to][0]] - down[to] << "\n";
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cin >> n;
  adj.resize(n + 1);
  dist.resize(n + 1);
  down.resize(n + 1);
  for (int i = 0; i < n - 1; i++) {
    int x, y;
    cin >> x >> y;
    adj[x].push_back(y);
    adj[y].push_back(x);
  }
  preprocess(1);
  cin >> m;
  for (int i = 0; i < m; i++) {
    int x, y;
    cin >> x >> y;
    int L = lca(x, y);
    if (x == y) {
      cout << n << "\n";
      continue;
    }
    int d = (dist[x] - dist[L] + dist[y] - dist[L] + 1);
    if (d % 2 == 0) {
      cout << 0 << "\n";
    } else {
      if (dist[x] - dist[L] == dist[y] - dist[L]) {
        cout << n - down[pre(x, L)] - down[pre(y, L)] << "\n";
      } else {
        d = (dist[x] - dist[L] + dist[y] - dist[L]);
        if (dist[x] < dist[y]) swap(x, y);
        int z = d / 2;
        trav(x, z);
      }
    }
  }
  return 0;
}
