n = int(input())
g = [[] for _ in range(n)]
for i in range(n-1):
    a,b = map(int,input().split())
    g[a-1].append(b-1)
    g[b-1].append(a-1)
 
q = [0]
parent = [-1]*n
for v in q:
    for c in g[v]:
        if c != parent[v]:
            q.append(c)
            parent[c] = v

r = [1]*n
for i in q[::-1]:
    if r[i] and i:
        r[parent[i]] = 0
print(sum(r))