// PATn.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include<vector>


using namespace std;



int main()
{
    unsigned n;
    vector<unsigned> data;
    cin >> n;

    unsigned tmp;
    for (unsigned i = 0; i < n; ++i)
    {
        cin >> tmp;
        data.push_back(tmp);
    }

    unsigned sum = 0;
    for (auto &r : data)
    {
        for (auto &k : data)
        {
            if (r != k)
            {
                auto tmp = r * 10 + k;
                sum = sum + tmp;
            }
        }
    }

    cout << sum;

    system("pause");
    return 0;
}