N = int(input())
C = input().split()
C = [int(i) for i in C]
sum = 0
for i in range(0, N):
    sum = sum + C[i]

th = sum / 10

deposit = 0
for i in range(0, N):
    if C[i] <= th:
        deposit = deposit + 1

print(deposit * 30)