import math
T = int(input())
for i in range(T):
  n = int(input())
  D = list(map(int, input().split()))
  ans = []
  for i in range(9):
    for j in range(D[i]):
      ans.append(str(i + 1))
  for i in range(9):
    ans.append(str(0))
  print(math.ceil(int("".join(ans)), n) * n)