import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val n = nextInt()
    val a = Array(n) { nextInt() }
    val max = a.max()!!
    val count = Array(max + 1) { 0 }
    for (i in 0 until n) {
        count[a[i]]++
    }
    var ans = 0L
    for (i in 1..max) {
        for (j in i..max) {
            ans += count[i] * count[j] * (i % j - j % i).absoluteValue
        }
    }
    println(ans)
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve()
    writer.flush()
}

// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()

fun next(): String {
    while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
    return st.nextToken()
}

fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion