#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	int i;
	int c[102];
	for (i = 0; i < n; i++)
		scanf("%d", &c[i]);
	int sum = 0;
	for (i = 0; i < n; i++)
		sum += c[i];
	int ans = 0;
	for (i = 0; i < n; i++)
		if (c[i] * 10 <= sum)
			ans++;
	ans *= 30;
	printf("%d\n", ans);
	return 0;
}