23 lines
634 B
Java
23 lines
634 B
Java
import java.util.*;
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import java.io.*;
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public class Main {
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public static void main(String[] args) throws IOException, ClassNotFoundException {
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// Scanner sc = new Scanner(new File("ONLINE.in"));
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Scanner sc = new Scanner(System.in);
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int n = sc.nextInt();
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int[] ke = new int[n+1];
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for(int i=0;i<n-1;i++){
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int x = sc.nextInt(), y = sc.nextInt();
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ke[x]++;
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ke[y]++;
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}
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int cnt=0;
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for(int i=1;i<=n;i++){
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if(ke[i]>1) cnt++;
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}
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if(cnt>1) System.out.println("No");
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else System.out.println("Yes");
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}
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}
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