#include <bits/stdc++.h>

using namespace std;

const int N = 200000 + 7;
int n;
int sub[N];
int par[N];
vector<int> g[N];

void build(int a, int p = -1)
{
    assert(sub[a] == 0);
    //cout << " vert : " << a << "\n";
    sub[a] = 1;
    par[a] = p;
    for (auto &b : g[a])
    {
        if (b == p) continue;
        //cout << "muchie " << a << " " << b << "\n";
        build(b, a);
        sub[a] += sub[b];
    }
}

bool test(int a, int p = -1)
{
    sub[a] = 1;
    vector<int> vals;
    bool good = 1;
    for (auto &b : g[a])
    {
        if (b == p) continue;
        good &= test(b, a);
        sub[a] += sub[b];
        vals.push_back(sub[b]);
    }
    sort(vals.begin(), vals.end());
    int current = 1;
    for (auto &x : vals)
    {
        // cout << x << " ";
        good &= (x <= current);
        current += x;
    }
    // cout << " and ";
    // cout << a << " : " << good << "\n";
    return good;
}

bool solvetc()
{
    cin >> n;
    for (int i = 1; i <= n; i++) g[i].clear(), sub[i] = 0;
    for (int i = 1; i < n; i++)
    {
        int a, b;
        cin >> a >> b;
        //cout << "edge " << a << " " << b << "\n";
        g[a].push_back(b);
        g[b].push_back(a);
    }
    build(1);
   // cout << " : " << sub[1] << "\n";
   // exit(0);
    assert(sub[1] == n);
    vector<int> pot;
    for (int a = 1; a <= n; a++)
    {
        vector<int> vals;
        vals.push_back(sub[1] - sub[a]);
        for (auto &b : g[a])
        {
            if (b == par[a]) continue;
            vals.push_back(sub[b]);
        }
        sort(vals.begin(), vals.end());
        bool good = 1;
        int current = 1;
        for (auto &x : vals)
        {
            good &= (x <= current);
            current += x;
        }
        if (good) pot.push_back(a);
    }
    for (auto &a : pot)
    {
        // cout << " a = " << a << "\n";
        if (test(a)) 
        {
            assert(sub[a] == n);
            return 1;
        }
    }
    return 0;
    cout << " --> ";
    for (auto &x : pot) cout << x << " ";
    cout << "\n";
    return 1;
}

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

    int t = 1;
    // cin >> t;
    while (t--)
    {
        bool ok = solvetc();
        if (ok) cout << "YES\n"; else cout << "NO\n";
    }

    return 0;
}