import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	C = getlist()
	S = sum(C)
	ans = 0
	for i in C:
		if i * 10 <= S:
			ans += 1

	print(ans * 30)


if __name__ == '__main__':
	main()