n = int(input())
link = [[] for _ in range(n)]
for i in range(n-1):
    a,b = list(map(int,input().split()))
    link[a-1].append(b-1)
    link[b-1].append(a-1)

ans=0
for i in range(n):
    ans+= max(len(link[i])-2,0)

print(ans)