#include<iostream>
#include<cstdio>
#include<vector>
using namespace std;

int main() {
	int n, c[100];
	scanf("%d", &n);
	
	int sum = 0;
	for (int i = 0; i < n; i++)
	{
		scanf("%d", &c[i]);
		sum += c[i];
	}
	sum = sum / 10;

	int count = 0;
	for (int i = 0; i < n; i++)
	{
		if (sum >= c[i])
		{
			count++;
		}
	}
	cout << count * 30 << endl;

	return 0;
}