n = int(input())
A = list(map(int, input().split()))
tot = sum(A)
x = tot % 10
cnt = [0] * 10
for a in A:
    cnt[a % 10] += 1

inf = 1 << 30    
dp = [[inf] * 10 for _ in range(10)]
dp[0][0] = 0
for i, c in enumerate(cnt):
    if i == 0:
        continue
    
    c = min(c, 9)
    for j in range(c + 1):
        for k in range(10):
            nj = (i * j + k) % 10
            dp[i][nj] = min(dp[i][nj], dp[i - 1][k] + j)
        
min_ = inf
for i in range(10):
    min_ = min(min_, dp[i][x])
print(n - min_)