#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int N;
vector<vector<int>> G;
ll ans = 0;
vector<int> dist(N);

int dfs(int v) {
    int cnt = 1;
    for (int e:G[v]) {
        dist[e] = dist[v] + 1;
        cnt += dfs(e);
    }
    ans += cnt*dist[v];
    ans %= MOD;
    return cnt;
}

int main(){
    cin >> N;
    G.resize(N);
    dist.resize(N);
    fill(dist.begin(),dist.end(),-1);
    vector<int> deg(N,0);

    rep(i,N - 1) {
        int a,b; cin >> a >> b;
        --a; --b;
        G[a].push_back(b);
        deg[b] ++;
    }
    int root;
    rep(i,N) {
        if (deg[i] == 0) {
            root = i;
            break;
        }
    }
    dist[root] = 0;
    dfs(root);
    cout << ans << endl;
    return 0;
}