#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int>cnt(N),tmp(N);
    for(int i = 0; i < N-1; i++) {
        int a,b;
        cin >> a >> b;
        a--;
        b--;
        cnt[a]++;
        cnt[b]++;
        tmp[a] = b;
        tmp[b] = a;
    }
    int cnt2 = 0;
    set<int>st;
    for(int i = 0; i < N; i++) {
        if(cnt[i] == 1) {
            cnt2++;
            st.insert(tmp[i]);
        }
    }
    if(cnt2 == 2 || st.size() == 1) {
        cout << "Yes" << endl;
    }
    else {
        cout << "No" << endl;
    }
}