package main

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

func main() {
	rd:=bf.NewReader(Stdin)
	var n int
	Fscan(rd,&n)
	var ans int64
	s:=make([]int64,501,501)
	t:=make([]int64,501,501)
	for i:=1;i<=n;i++ {
		var a int
		Fscan(rd,&a)
		s[a]++
		t[a]+=int64(i)
		for k,v:=range t {
			e:=s[k]*int64(i)-v
			if k<a {
				ans+=e*int64(a-k)
			} else {
				ans+=e*int64(k-a)
			}
		}
	}
	ans+=ans
	Println(ans)
}