#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

const int max_n = 1010101;
ll MOD = 1e9 + 7;
int n;
vector<int> par;
vector<int> g[max_n];

vector<ll> dp1, dp2, dp3;

void dfs(int p){
	dp2[p]++;
	dp2[p] %= MOD;

	for(int u : g[p]){
		dfs(u);
		dp1[p] += dp1[u] + dp2[u] + dp3[u];
		dp1[p] %= MOD;

		dp2[p] += dp2[u];
		dp2[p] %= MOD;

		dp3[p] += dp2[u] + dp3[u];
		dp3[p] %= MOD;
	}
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	cin >> n;
	par.resize(n, -1);
	rep(i, n-1){
		int a, b;
		cin >> a >> b;
		a--; b--;
		par[b] = a;
		g[a].push_back(b);
	}

	int root = -1;
	rep(i, n){
		if(par[i] == -1) root = i;
	}
	
	dp1.resize(n, 0);
	dp2.resize(n, 0);
	dp3.resize(n, 0);

	dfs(root);
	cout << dp1[root] << endl;
}