#include <bits/stdc++.h>
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
#define fi first
#define se second
typedef long long ll;
typedef vector<ll> vec;
typedef vector<vec> mat;

ll N,M,H,W,Q,K,A,B;
string S;
//const ll MOD = 998244353;
const ll MOD = (1e+9) + 7;
typedef pair<ll, ll> P;
const ll INF = (1LL<<58);

void dfs(mat &G, vec &score, vec &num, int v){
    for(ll to : G[v]){
        dfs(G, score, num, to);
        score[v] += score[to] + num[to];
        num[v] += num[to];
    }
}

int main() {
    cin>>N;
    mat G(N, vec(0));
    vec roo(N, 0);
    rep(i,N - 1){
        cin>>A>>B;
        --A; --B;
        G[A].push_back(B);
        ++roo[B];
    }
    int p = min_element(ALL(roo)) - roo.begin();
    vec score(N, 0), num(N, 1);
    dfs(G, score, num, p);
    cout<<accumulate(ALL(score), 0LL)<<endl;
}