import sys
sys.setrecursionlimit(10 ** 9)
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')

n = int(input())
edges = [[] for _ in range(n)]
for _ in range(n - 1):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    edges[u].append(v)
    edges[v].append(u)

size = [1] * n
ans = n * n
def dfs(pos, bpos):
    global ans
    for npos in edges[pos]:
        if npos == bpos:
            continue
        dfs(npos, pos)
        size[pos] += size[npos]
        ans += size[npos] * (n - size[npos])
    ans += size[pos] * (n - size[pos])
dfs(0, -1)
print(ans)