#include <fstream>
using namespace std;
ifstream cin("numere.in");
ofstream cout("numere.out");
int main()
{
int n, s = 0, num = 0;
cin >> n;
for (int i = 1; i <= n; i++)
{
float x;
cin >> x;
if ((int) x >= 10)
{
s += x;
num++;
}
}
cout << s/num;
cin.close();
cout.close();
return 0;
}