#pragma GCC optimize("O3")
#pragma GCC target("tune=native")
#pragma GCC target("avx")
#include <iostream>
#include <vector>
#include <algorithm>
using ull = unsigned long long;
constexpr ull MOD = 1000000007;
int main()
{
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    std::size_t N;
    std::cin >> N;
    std::vector<ull> R(N);
    for (std::size_t i = 0; i < N; i++) { std::cin >> R[i]; }
    std::vector<std::vector<std::size_t>> g(N);
    for (std::size_t i = 0; i < N - 1; i++) {
        std::size_t u, v;
        std::cin >> u >> v, u--, v--;
        g[u].push_back(v), g[v].push_back(u);
    }
    std::vector<std::size_t> sindo(N, 0);
    auto dfs = [&](auto&& self, const std::size_t s, const std::size_t p, const std::size_t R) -> void {
        sindo[s]++;
        for (const std::size_t to : g[s]) {
            if (to == p) { continue; }
            if (to >= R) { continue; }
            self(self, to, s, R);
        }
    };

    for (std::size_t i = 0; i < N; i++) { dfs(dfs, i, N, i); }
    ull ans = 1;
    for (std::size_t i = 0; i < N; i++) { (ans *= (sindo[i] + R[i]) % MOD) %= MOD; }
    std::cout << ans << std::endl;
    return 0;
}