#include<cmath>
double Money(int num)
{
	return ceil(num/70.0)*0.1;//celi 向上取整 
}
using namespace std;
int main()
{
	int n=0;
	cin>>n;
	double sum=0;
	for(int i=1;i<=n;i++)
	{
		int num =0;
		cin>>num;
		sum+=Money(num); 
	}
	printf("%.1lf",sum);
	return 0;
}