N=int(input())
G=[[]for i in range(N)]
for i in range(N-1):
	a,b=map(int,input().split())
	a-=1
	b-=1
	G[a].append(b)
	G[b].append(a)
order=[0]
pare=[-1]*N
pare[0]=-2
size=[0]*N
dp=[0]*N
for i in range(N):
	a=order[i]
	for x in G[a]:
		if pare[x]==-1:
			pare[x]=a
			order.append(x)
for i in range(N):
	a=order[N-1-i]
	for x in G[a]:
		if x!=pare[a]:
			size[a]+=size[x]
	size[a]+=1
	dp[0]+=size[a]
ans=0
for i in range(N):
	a=order[i]
	for x in G[a]:
		if pare[x]==a:
			dp[x]=dp[a]+N-2*size[x]
	ans+=dp[a]
print(ans)