N=int(input())

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