t = int(input())
for _ in range(t):
    n = int(input())
    a = list(map(int, input().split()))[1:]
    if a.count(0) == n-1:
        print(1)
        continue
    cnt2 = [0]*(n-1)
    cnt5 = [0]*(n-1)
    for i in range(n-1):
        while a[i] % 10 == 0 and a[i] != 0:
            a[i] //= 10
        while a[i] % 2 == 0 and a[i] != 0:
            cnt2[i] += 1
            a[i] //= 2
        while a[i] % 5 == 0 and a[i] != 0:
            cnt5[i] += 1
            a[i] //= 2
    print(10**(max(max(cnt2), max(cnt5))+1)//2**max(cnt2)//5**max(cnt5))