package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd:=bf.NewReader(Stdin)
	var n int
	Fscan(rd,&n)
	tree:=make([][]int,n+1)
	for e:=0;e<n-1;e++ {
		var u,v int
		Fscan(rd,&u,&v)
		tree[u]=append(tree[u],v)
		tree[v]=append(tree[v],u)
	}
	visited:=make([]bool,n+1)
	var ans int
	var dfs func(t int) (a,b,c int)
	dfs = func(t int) (a,b,c int){
		visited[t]=true
		a=1
		for _,k:=range tree[t] {
			if visited[k] {
				continue
			}
			x,y,z:=dfs(k)
			ans+=(a+b+c)*x+(a+b)*y+a*z
			b+=x
			c+=y
		}
		return
	}
	dfs(1)
	Println(ans)
}