#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
vector<long long> make(int x){
  vector<long long> A(1001, 0);
  A[x] = 1;
  return A;
}
vector<long long> operator +(vector<long long> A, vector<long long> B){
  vector<long long> C(1001);
  for (int i = 0; i <= 1000; i++){
    C[i] = A[i] + B[i] % MOD;
  }
  return C;
}
vector<long long> operator *(vector<long long> A, long long x){
  for (int i = 0; i <= 1000; i++){
    A[i] *= x;
    A[i] %= MOD;
  }
  return A;
}
vector<long long> max_convolution(vector<long long> A, vector<long long> B){
  for (int i = 0; i < 1000; i++){
    A[i + 1] += A[i];
    A[i + 1] %= MOD;
    B[i + 1] += B[i];
    B[i + 1] %= MOD;
  }
  vector<long long> C(1001);
  for (int i = 0; i <= 1000; i++){
    C[i] = A[i] * B[i] % MOD;
  }
  for (int i = 999; i >= 0; i--){
    C[i + 1] += MOD - C[i];
    C[i + 1] %= MOD;
  }
  return C;
}
int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  vector<vector<int>> E(N);
  for (int i = 0; i < N - 1; i++){
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    E[u].push_back(v);
    E[v].push_back(u);
  }
  vector<long long> POW(N);
  POW[0] = 1;
  for (int i = 0; i < N - 1; i++){
    POW[i + 1] = POW[i] * 2 % MOD;
  }
  vector<int> p(N, -1);
  vector<vector<int>> c(N);
  queue<int> Q;
  Q.push(0);
  vector<int> bfs;
  while (!Q.empty()){
    int v = Q.front();
    Q.pop();
    bfs.push_back(v);
    for (int w : E[v]){
      if (w != p[v]){
        p[w] = v;
        c[v].push_back(w);
        Q.push(w);
      }
    }
  }
  reverse(bfs.begin(), bfs.end());
  vector<int> sz(N, 1);
  for (int v : bfs){
    for (int w : c[v]){
      sz[v] += sz[w];
    }
  }
  vector<vector<long long>> dp1(N, vector<long long>(1001, 0));
  for (int v : bfs){
    dp1[v] = make(A[v]);
    for (int w : c[v]){
      dp1[v] = max_convolution(dp1[v], dp1[w]) + dp1[v] * POW[sz[w] - 1];
    }
  }
  reverse(bfs.begin(), bfs.end());
  vector<vector<long long>> dp2(N, vector<long long>(1001, 0));
  dp2[0][0] = 1;
  for (int v : bfs){
    int cnt = c[v].size();
    vector<vector<long long>> L(cnt + 1, vector<long long>(1001, 0));
    L[0][0] = 1;
    for (int i = 0; i < cnt; i++){
      int w = c[v][i];
      L[i + 1] = max_convolution(L[i], dp1[w]) + L[i] * POW[sz[w] - 1];
    }
    vector<vector<long long>> R(cnt + 1, vector<long long>(1001, 0));
    R[cnt][0] = 1;
    for (int i = cnt - 1; i >= 0; i--){
      int w = c[v][i];
      R[i] = max_convolution(R[i + 1], dp1[w]) + R[i + 1] * POW[sz[w] - 1];
    }
    for (int i = 0; i < cnt; i++){
      int w = c[v][i];
      dp2[w] = max_convolution(dp2[v], max_convolution(L[i], R[i + 1]));
      dp2[w] = max_convolution(dp2[w], make(A[w])) + make(A[w]) * POW[N - 1 - sz[w]];
    }
  }
  long long ans = 0;
  for (int i = 0; i < N; i++){
    vector<long long> dp = max_convolution(dp1[i], dp2[i]);
    for (int j = 0; j <= 1000; j++){
      ans += dp[j] * j % MOD;
    }
    ans %= MOD;
  }
  cout << ans << endl;
}