#include <stdio.h>

#define DEPOSIT	30

int main(void)
{
	int n;
	int c[100] = {0};
	int total = 0;
	int count = 0;
	int i;

	scanf("%d", &n);

	for (i = 0; i < n; i++) {
		scanf("%d", &c[i]);
		total += c[i];
	}
	
	for (i = 0; i < n; i++) 
		if (c[i] * 10 <= total)
			count++;
	
	printf("%d\n", count * DEPOSIT);

	return 0;
}