from itertools import combinations
def Ten(N, A):
    sumA = sum(A)
    if sumA % 10 == 0:
        return N
    tens = []
    for i in range(1, N // 2 + 1):
        combs = list(combinations(A, i))
        for j in range(len(combs)):
            sumj1 = sum(combs[j])
            sumj2 = sumA - sumj1
            if sumj1 % 10 == 0:
                tens.append(i)
            if sumj2 % 10 == 0:
                return N - i
    if len(tens) > 0:
        return max(tens)
    else:
        return 0

def main():
    N = int(input())
    A = list(map(int, input().split()))
    print(Ten(N, A))

if __name__ == '__main__':
    main()