#include <stdio.h>

int main(void) {
	int num;
	int money[100];
	int ave = 0;
	int pay = 0;
	int i;

	scanf("%d", &num);
	for (i=0; i<num; i++) {
		scanf("%d ", &money[i]);
		ave += money[i];
	}

	ave /= 10;
	
	for (i=0; i<num; i++) {
		if (money[i] <= ave) {
			pay += 30;
		}
	}

	printf("%d\n", pay);
	
	return 0;
}