#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 200'000 + 5;
int n;

vector<int> graph[MAX_N];

vector<int> order_bfs(const vector<int> &leafs) {
    deque<int> q;
    vector<int> power(n);
    vector<bool> used(n);
    for (int i = 0; i < n; ++i) {
        power[i] = graph[i].size();
        used[i] = false;
    }

    for (int e: leafs) {
        q.emplace_back(e);
        used[e] = true;
    }
    vector<int> order;
    while (!q.empty()) {
        int v = q.front();
        order.emplace_back(v);
        q.pop_front();
        for (int u: graph[v]) {
            if (used[u]) {
                continue;
            }
            power[u]--;
            if (power[u] <= 1) { // o-o-o vs o-o
                used[u] = true;
                q.emplace_back(u);
            }
        }
    }
    return order;
}

bool move_ants(const vector<int> &order) {
    vector<int> ants_amount(n, 1);
    set<pair<int, int>> q;
    vector<bool> inserted(n, false);
    int pointer = 0;
    while (true) {
        if (q.empty()) {
            if (pointer == order.size()) {
                break;
            }
            int v = order[pointer++];
            inserted[v] = true;
            q.insert({ants_amount[v], v});
        }
        pair<int, int> s = *q.begin();

        int a_amount = s.first, v = s.second;
        if (a_amount == n) {
            break;
        }

        int u = v;
        int cnt = 0;
        for (int uu : graph[v]) {
            if (ants_amount[uu] != 0) {
                cnt++;
                u = uu;
            }
        }
        if (a_amount > ants_amount[u] || cnt >= 2 || cnt == 0) {
            if (pointer == order.size()) {
                break;
            }

            int uu = order[pointer++];
            q.insert({ants_amount[uu], uu});
            inserted[uu] = true;
            continue;
        }
        q.erase(s);


        if (u == v) {
            assert(ants_amount[u] == n);
            break;
        }
        int old_au = ants_amount[u];
        if (inserted[u]) {
            q.erase({old_au, u});
        }
        ants_amount[u] += ants_amount[v];
        ants_amount[v] = 0;
        if (inserted[u]) {
            q.insert({ants_amount[u], u});
        }
    }

    bool found = false;
    for (int i = 0; i < n; ++i) {
        if (ants_amount[i] == n) {
            found = true;
        }
    }
    return found;
}

int main() {
    cin.tie(nullptr);
    cout.tie(nullptr);
    iostream::sync_with_stdio(false);

    cin >> n;


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

    if (n == 1) {
        cout << "YES\n";
        return 0;
    }

    vector<int> leafs;
    for (int i = 0; i < n; ++i) {
        if (graph[i].size() == 1) {
            leafs.emplace_back(i);
        }
    }

    vector<int> order = order_bfs(leafs);

    bool success = move_ants(order);
    if (success) {
        cout << "YES\n";
    } else {
        cout << "NO\n";
    }
}