from sys import setrecursionlimit
import pypyjit
setrecursionlimit(10**5)
pypyjit.set_param('max_unroll_recursion=-1')


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

f = [[0]*4 for _ in range(N+1)]
parent = [-1]*(N+1)
def dfs(v, p):
    f[v][0] = 1
    for u in to[v]:
        if u == p:
            continue
        dfs(u, v)
        parent[u] = v
        f[v][1] += f[u][0]
        f[v][2] += f[u][1]
        f[v][3] += f[u][2]

dfs(0, -1)

ans = 0
for v in range(N):
    p = parent[v]
    pp = parent[p]
    ppp = parent[pp]

    ans += f[v][1] + (f[p][0] if p != -1 else 0)
    ans += f[v][2] + (f[p][1] - f[v][0] if p != -1 else 0) + (f[pp][0] if pp != -1 else 0)
    ans += f[v][3] + (f[p][2] - f[v][1] if p != -1 else 0) + (f[pp][1] - f[v][0] if pp != -1 else 0) + (f[ppp][0] if ppp != -1 else 0)

print(ans//2)