T = int(input())
for _ in range(T):
    M = int(input())
    D = list(map(int, input().split()))
    s = ''
    for i in range(len(D)):
        s += str(i+1)*D[i]
    s += '0'*9
    s = int(s)
    if s%M == 0:
        print(s)
    else:
        print(s + M-(s%M))