#include <bits/stdc++.h>
#include <cstdio>
using namespace std;

int n,maxai = -1;
int ans;
int a[1000005];

int main()
{
	cin >> n;
	ans += n * 6;
	for (int i = 1;i <= n;i ++)
	{
		cin >> a [i];
	}
	for (int i = 1;i <= n;i ++)
	{
		if (maxai <= a [i])
		maxai = a [i];
	}
	ans += maxai * 10;
	cout << ans;
	return 0;
}