#include <stdio.h>

int main(void)
{
	int n, c[100], i, s = 0, a = 0;
	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &c[i]);
		s += c[i];
	}
	for (i = 0; i < n; i++) c[i] <= s / 10 ? a++ : 0;
	printf("%d", 30 * a);
	return 0;
}