# -*- coding:utf-8 -*-
import sys

if __name__ == "__main__":
	n = input()
	nums = map(int,raw_input().split())
	sum = 0
	ans = 0
	for i in nums:
		sum += i
	for i in nums:
		if i == 0:
			ans += 30
		elif sum / i >= 10:
			ans += 30
	print ans