from collections import deque
N=int(input())
table=[0 for i in range(N)]
for i in range(N-1):
    a,b=map(int,input().split())
    a,b=a-1,b-1
    table[a]+=1
    table[b]+=1
num=0
for i in range(N):
    if table[i]==1:
        num+=1
print(num-2)