fun main(){
    val number = readln().toInt()
    val list = readln().split(" ").map { it.toInt() }
    var toleSim = 0L
    var x = 0
    while (x < list.size) {
        var y = x+1
        while(y < list.size && list[x] != list[y]){

            y++
        }
        if(y < list.size && list[x] == list[y]){
            toleSim += y - x
        }
        x++
    }
    println(toleSim)
}