#include <iostream>
#include <queue>
#include <vector>
#include <fstream>
using namespace std;
const int maxn = 1e5 + 10;
int n;
vector<int> graph[maxn];
int dfs(int node, int parent) {
    int cows = (int) graph[node].size();
    if(parent == -1) {
        cows++;
    }


    int cnt_cows = 1, days_to_send = 0;
    while(cnt_cows < cows) {
        cnt_cows *= 2;
        days_to_send++;
    }
    int result = days_to_send;
    for(int neighbour : graph[node]) {
        if(neighbour != parent) {
            result += dfs(neighbour, node) + 1;
        }
    }
    return result;
}
int main() {
    cin >> n;

    for(int i = 1; i < n; i++) {
        int a, b;
        cin >> a >> b;
        a--;
        b--;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    cout << dfs(0, -1) << endl;
    return 0;
}