n = int(input())
cnt = [0] + list(map(int, input().split()))
tot = 0
two = 8
five = 5
seven = 7
for i, c in enumerate(cnt):
    if c == n:
        print(str(i) * n)
        exit()
    
    tot += i * c
    if c > 0:
        if i == 8:
            pass
        elif i == 4:
            two = min(two, 4)
        elif i == 2:
            two = min(two, 2)
        else:
            two = 1
        if i != 5:
            five = 1
        if i != 7:
            seven = 1
        
ans = two * five * seven
if tot % 9 == 0:
    ans *= 9
elif tot % 3 == 0:
    ans *= 3
print(ans)