import sys
import math
from itertools import product, permutations, combinations, accumulate
from heapq import heapify, heappush, heappop
from collections import deque, defaultdict, Counter
from bisect import bisect, bisect_left, bisect_right
from copy import copy, deepcopy
#from sortedcontainers import SortedSet, SortedList, SortedDict

sys.setrecursionlimit(10**7)
INF = float('inf')
LINF = 1 << 60
MOD = 10**9+7

def mii():
    return map(int, sys.stdin.readline().split())


T = int(input())
test = []
for i in range(T):
    test.append(list(mii()))

for i in range(T):
    N, M = test[i]

    n = (N + 3) // 4
    p = (4 - (N % 4)) % 4

    if M <= 4*n + p:
        print(n)
    else:
        print(n + (M - 4*n - p + 7) // 8)