import sys
sys.setrecursionlimit(500000)

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

used=[0]*N
total=0
def dfs(i):
    global total
    used[i]=1
    dp=[0,0,0]
    c=[0,0,0]
    for np in edge[i]:
        if used[np]==1:
            continue
        d=dfs(np)
        total+=d[0]*c[0]+d[0]*c[1]+d[1]*c[0]
        for j in range(3):
            c[j]+=d[j]
    total+=c[0]+c[1]+c[2]
    dp[0]=1
    dp[1]=c[0]
    dp[2]=c[1]
    return dp

dfs(0)
print(total)