#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0;i<((int)(n));i++)
#define reg(i,a,b) for(int i = ((int)(a));i<=((int)(b));i++)
#define irep(i,n) for(int i = ((int)(n)-1);i>=0;i--)
#define ireg(i,a,b) for(int i = ((int)(b));i>=((int)(a));i--)
typedef long long ll;

/*
*/

ll n,r[200010],ans=1,mod=1e9+7;
vector<ll> v[200010],v2[200010],d(200010);

struct UnionFind{
	int n;
	vector<int> p;
	UnionFind(){}
	UnionFind(int sz):n(sz),p(sz,0){iota(p.begin(),p.end(),0);}
	int find(int x){
		return (x==p[x]?x:p[x]=find(p[x]));
	}
	bool same(int x,int y){
		return find(x)==find(y);
	}
	void unite(int x,int y){
		x=find(x);y=find(y);
		if(x==y) return;
		if(x<y) swap(x,y);
		p[y]=x;
	}
};

int dijkstra1(int s,vector<ll>& d,vector<ll> v[],ll INF=1e18){
	int farthest=s;
	queue<int> Q;
	rep(i,d.size())d[i]=INF;
	Q.push(s);
	d[s]=0;
	while(!Q.empty()){
		int p = Q.front();Q.pop();
		if(d[farthest]<d[p])farthest=p;
		for(int q:v[p]){
			if(d[q]>d[p]+1){
				d[q]=d[p]+1;
				Q.push(q);
			}
		}
	}
	return farthest;
}

void init(){
	cin>>n;
	rep(i,n)cin>>r[i];
	rep(i,n-1){
		ll a,b;
		cin>>a>>b;
		v[a-1].push_back(b-1);
		v[b-1].push_back(a-1);
	}
}

int main(void){
	init();
	UnionFind f(n);
	rep(i,n){
		for(ll p:v[i]){
			if(p<i){
				v2[f.find(p)].push_back(i);
				v2[i].push_back(f.find(p));
				f.unite(p,i);
			}
		}
	}
	dijkstra1(n-1,d,v2);
	rep(i,n)ans=(ans*(d[i]+1+r[i]))%mod;
	cout<<ans<<endl;
	return 0;
}