#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)

# _INPUT = """12
# 1 2
# 2 3
# 3 4
# 4 5
# 1 6
# 6 7
# 6 8
# 7 11
# 7 12
# 8 9
# 9 10

# """
# sys.stdin = io.StringIO(_INPUT)

INF = 10**10

def dfs(parent, p):

    leaf = True
    for p1 in G[p]:
        if p1 == parent:
            continue
        dfs(p, p1)
        if Deleted[p1] == 0:
            leaf = False

    if not leaf:
        Deleted[p] = 1


N = int(input())
G = [list() for _ in range(N)]
for _ in range(N-1):
    u, v = map(int, input().split())
    G[u-1].append(v-1)
    G[v-1].append(u-1)

Deleted = [0] * N
dfs(-1, 0)

ans = Deleted.count(0)
print(ans)