N = int(input())
e = [ [] for i in range(N)]
for i in range(N-1):
    a,b = map(int,input().split())
    a-=1
    b-=1
    e[a].append(b)
    e[b].append(a)



col = [ -1 for i in range(N)]
ans = 0
def dfs(n,c,pre):
    global ans
    if pre != -1 and len(e[n]) == 1 and e[n][0] == pre:
        ans += 1

    col[n] = c
    for node in e[n]:
        if col[node] == -1:
            dfs(node,c+1,n)

k = -1
m = 10**10
for i in range(N):
    if len(e[i]) < m:
        k = i
        m = len(e[i])

dfs(k,0,-1)
print(ans-1)