include

using namespace std; int a(int arr[], int n) {

int q = 0;
for (int i = 0; i < n; i++)
{
	if (arr[i] >= 10)
	{
		q++;
	}
}
return q + 5;

} int b(int arr[], int n) {

int q = 0;
for (int i = 0; i < n; i++)
{
	if (arr[i] >= 5)
	{
		q++;
	}
}
return q;

} int main() {

int arr[1000];
int n = 0;
cin >> n;
for (int i = 0; i < n; i++)
{
	cin >> arr[i];
}
int r1 = a(arr, n);
int r2 = b(arr, n);
cout <<( r1 < r2 ? r1 : r2);
return 0;

}