# 次数が3のところを切っていけばいい
# 閉路はない、木だから
# 切るときは、お互いに次数が3以上のところを優先する

N = int(input())
edges = [[] for i in range(N+1)]
degree = [0]*(N+1)
for i in range(N-1):
    a, b = map(int, input().split())
    edges[a].append(b)
    edges[b].append(a)
    degree[a] += 1
    degree[b] += 1

from collections import deque
# まず次数3を超える同士を切る
que1 = deque()
for i in range(1, N+1):
    if degree[i] > 2:
        que1.append(i)
        
count = 0
while que1:
    current = que1.popleft()
    
    if degree[current] > 2:
        for nxt in edges[current]:
            if degree[nxt] > 2:
                edges[current].remove(nxt)
                edges[nxt].remove(current)
                degree[current] -= 1
                degree[nxt] -= 1
                count += 1
            if degree[current] <= 2:
                break
            
que2 = deque()
for i in range(1, N+1):
    if degree[i] > 2:
        que2.append(i)
        
while que2:
    current = que2.popleft()
    
    if degree[current] > 2:
        for nxt in edges[current]:
            edges[current].remove(nxt)
            edges[nxt].remove(current)
            degree[current] -= 1
            degree[nxt] -= 1
            count += 1
            if degree[current] <= 2:
                break    

print(count)