#!/usr/bin/env python3
# -*- coding: utf-8-*-
import numpy as np

n = int(input())
v = np.zeros((n))

for i in range(n-1):
    a, b = map(int, input().split(" "))
    v[a-1] += 1
    v[b-1] += 1
a = 0
for i in range(n):
    if v[i] > 2:
        a += (v[i]-2)
print(int(a))