#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = max(a, b)
#define chmin(a, b) a = min(a, b)
#define out(a) cout << a << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
int main() {
    int n; cin >> n;
    vector<int> v[n];
    rep(i, n - 1) {
        int a, b; cin >> a >> b; a--; b--;
        v[a].eb(b);
        v[b].eb(a);
    }
    int sum = 0;
    rep(i, n) {
        if (SZ(v[i]) > 2) sum += SZ(v[i]) - 2;
    }
    out(sum);
}