PAT1056

#include<iostream>
#include <iomanip>
#include <cstdio>
#include<string>
#include<vector>
#include<array>
#include<math.h>
#include <ctype.h>
#include<algorithm>
using namespace std;

int main() 
{
	int a[10],n,i,j,sum = 0;
	cin >> n;
	for (i = 0; i < n; i++)
	{
		cin >> a[i];
	}
	for (i = 0; i < n; i++)
	{
		for (j = 0; j < n; j++)
		{
			if (i == j)
				continue;
			sum += a[i] * 10 + a[j];
		}
	}
	cout << sum;
	return 0;
}