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

fun pow(a: Int, b: Int): Long {
    var ret = 1L
    repeat(b) {
        ret *= a
    }
    return ret
}

fun PrintWriter.solve() {
    val n = nextInt()
    val a = Array(n) { nextInt() }
    val counter = Array(9) { 0L }
    for (i in 0 until n) {
        counter[a[i]]++
    }
    var ans = 0L
    for (b in 1..8) {
        for (e in 1..8) {
            ans += counter[b] * counter[e] * pow(b, e)
        }
    }
    println(ans)
}

fun main() {
    Thread(null, {
        val writer = PrintWriter(System.out, false)
        writer.solve()
        writer.flush()
    }, "solve", abs(1L.shl(26)))
        .apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } }
        .apply { start() }.join()
}

// 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