n=int(input())
g=[[]for _ in range(n)]
for _ in range(n-1):
  u,v=map(int,input().split())
  g[u-1]+=v-1,
  g[v-1]+=u-1,
ans=0
for i in range(n):
  q=[(0,i)]
  s={i}
  while q:
    t,p=q.pop()
    if t==3:
      continue
    for v in g[p]:
      if v not in s:
        q+=(t+1,v),
        s|={v}
  ans+=len(s)-1
print(ans//2)