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

ans=0
for i in range(n):
    if len(G[i])>=3:
        ans+=len(G[i])-2
    
print(ans)