from collections import defaultdict
N=int(input())
E=defaultdict(list)
for i in range(N-1):
  a,b=map(int,input().split())
  E[a].append(b)
  E[b].append(a)
ans=0
for i in range(1,N+1):
  ans+=max(len(E[i])-2,0)
print(ans)