def solve():
  N, M = map(int, input().split())

  n = (N + 3) // 4
  if N%4 == 0:
    x = 4*n
  else:
    x = 4*(n-1) + (8 - N%4)

  if M <= x:
    print(n)
  else:
    M -= x
    m = (M + 7) // 8
    print(n + m)

def main():
  T = int(input())
  for _ in range(T):
    solve()

main()