import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int[] counts = new int[9];
        while (n-- > 0) {
            counts[sc.nextInt()]++;
        }
        long ans = 0;
        for (int i = 1; i <= 8; i++) {
            for (int j = 1; j <= 8; j++) {
                ans += pow(i, j) * counts[i] * counts[j];
            }
        }
        System.out.println(ans);
    }
    
    static long pow(int x, int p) {
        if (p == 0) {
            return 1;
        } else {
            return pow(x, p - 1) * x;
        }
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}