#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vin=vector<int>;
using vll=vector<long long>;
using vvin=vector<vector<int>>;
using vvll=vector<vector<long long>>;
using vstr=vector<string>;
using vvstr=vector<vector<string>>;
using vch=vector<char>;
using vvch=vector<vector<char>>;
using vbo=vector<bool>;
using vvbo=vector<vector<bool>>;
using vpii=vector<pair<int,int>>;
using pqsin=priority_queue<int,vector<int>,greater<int>>;
#define mp make_pair
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep2(i,s,n) for(int i=(s);i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define decp(n) cout<<fixed<<setprecision((int)n)
const ll inf=1e9+7;
const ll INF=1e18;


int main(){
    int n;cin>>n;
    vin a(n-1),b(n-1);
    vin par(n+1,(int)inf);
    vvin baby(n+1);
    rep(i,n-1){
        cin>>a[i]>>b[i];
        baby[a[i]].push_back(b[i]);
        par[b[i]]=a[i];
    }
    vin child(n+1,1);//the number of children
    queue<int> q;
    rep(i,n)if(baby[i+1].size()==0)q.push(i+1);
    int root;
    while(q.size()){
        auto p=q.front();q.pop();
        if(par[p]==(int)inf){
            root=p;
            break;
        }
        child[par[p]]+=child[p];
        q.push(par[p]);
    }
    queue<int> qq;qq.push(root);
    vin d(n+1);d[root]=1;
    while(qq.size()){
        auto p=qq.front();qq.pop();
        if(baby[p].size()==0)continue;
        for(auto tmp:baby[p]){
            d[tmp]=d[p]+1;
            qq.push(tmp);
        }
    }
    ll ans=(ll)0;
    rep(i,n-1){
        ans+=(d[a[i]]*child[b[i]])%inf;
        ans%=inf;
    }
    cout<<ans<<endl;
}