N = int(input())
A = [int(a) for a in input().split()]

L = [0]*10
M = 0
for a in A:
    L[a%10] += 1
    M += a%10
    M %= 10

num = N
for a in range(min(L[1]+1, 10)):
    for b in range(min(L[2]+1, 5)):
        for c in range(min(L[3]+1, 10)):
            for d in range(min(L[4]+1, 5)):
                for e in range(min(L[5]+1, 2)):
                    for f in range(min(L[6]+1, 5)):
                        for g in range(min(L[7]+1, 10)):
                            for h in range(min(L[8]+1, 5)):
                                for i in range(min(L[9]+1, 10)):
                                    temp = a+b*2+c*3+d*4+e*5+f*6+g*7+h*8+i*9
                                    if temp%10 == M:
                                        num = min(num, a+b+c+d+e+f+g+h+i)
print(N-num)