import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes")
no = lambda :print("no");No = lambda :print("No")
#######################################################################
n = ni()
g = [[] for i in range(n)]
for i in range(n-1):
    a,b = na()
    g[a-1].append(b-1)
    g[b-1].append(a-1)

dp = [[1,0,0,0] for i in range(n)]
seen = [0]*n
q = [0]
et = []
seen[0] = 1
p = [-1] * n
chi = [[] for i in range(n)]
while q:
    x = q.pop()
    et.append(x)
    for y in g[x]:
        if seen[y]:
            continue
        seen[y] = 1
        p[y] = x
        chi[x].append(y)
        q.append(y)

for x in et[::-1]:
    for y in chi[x]:
        dp[x][1] += dp[y][0]
        dp[x][2] += dp[y][1]
        dp[x][3] += dp[y][2]

ans = 0
for i in range(n):
    x = i
    t = 3
    s = sum(dp[x])
    while p[x] != -1 and t:
        y = x
        x = p[x]
        s += sum(dp[x][:t]) - sum(dp[y][:t-1])
        t -= 1
    ans += s
    #print(s)
print((ans-n)//2)