from collections import Counter,defaultdict,deque
from heapq import heappop,heappush,heapify
from bisect import bisect_left,bisect_right
import sys,math,itertools,pprint,fractions
sys.setrecursionlimit(10**8)
mod = 10**9+7
INF = float('inf')
def inp(): return int(sys.stdin.readline())
def inpl(): return list(map(int, sys.stdin.readline().split()))
def inpl_1(): return list(map(lambda x:int(x)-1, sys.stdin.readline().split()))
def err(x): print(x); exit()

n = inp()
g = [[] for _ in range(n)]
for _ in range(n-1):
    a,b = inpl_1()
    g[b].append(a); g[a].append(b)
res = 0
def dfs(u,p=-1):
    global res
    su = 0
    for v in g[u]:
        if p==v: continue
        now = dfs(v,u)
        res += now*(n-now)
        su += now
    up = (n-su-1)
    res += up*(n-up)
    res += n
    return su+1
dfs(0)
print(res)