# coding=utf-8:

n = int(input())
c = list(map(int, input().split()))
c_total = 0
for i in c:
    c_total += i
count = 0
for i in range(len(c)):
    if c[i] > c_total * 0.1:
        continue
    else:
        count += 1

print(count * 30)