package main

import . "fmt"

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