import sys
import pypyjit
import itertools
import heapq
import math
from collections import deque, defaultdict
import bisect

input = sys.stdin.readline
sys.setrecursionlimit(10 ** 6)
pypyjit.set_param('max_unroll_recursion=-1')


def index_lt(a, x):
    'return largest index s.t. A[i] < x or -1 if it does not exist'
    return bisect.bisect_left(a, x) - 1


def index_le(a, x):
    'return largest index s.t. A[i] <= x or -1 if it does not exist'
    return bisect.bisect_right(a, x) - 1


def index_gt(a, x):
    'return smallest index s.t. A[i] > x or len(a) if it does not exist'
    return bisect.bisect_right(a, x)


def index_ge(a, x):
    'return smallest index s.t. A[i] >= x or len(a) if it does not exist'
    return bisect.bisect_left(a, x)


N = int(input())
E = [[] for _ in range(N)]
for _ in range(N - 1):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    E[a].append(b)
    E[b].append(a)
cnt = [0] * N


def dfs(v, p):
    res = 1
    for d in E[v]:
        if d == p:
            continue
        res += dfs(d, v)
    cnt[v] = res
    return res


def dfs2(v, p):
    global ans, acc
    if not p < 0:
        acc += N - 2 * cnt[v]
    ans += acc
    for d in E[v]:
        if d == p:
            continue
        dfs2(d, v)
    acc -= N - 2 * cnt[v]


dfs(0, -1)
ans = 0
acc = sum(cnt)
dfs2(0, -1)
print(ans)