T = int(input())
for _ in range(T):
    X, Y = map(int, input().split())
    c = X
    i = 0
    while X >= 2 ** (i + 1):
        i += 1
    # print(X, i)
    y = 2 ** (i + 1) - X
    x = Y
    if y <= 2**x:
        print(2 ** (i + 1) - 1)
        continue
    ok = False
    for k in range(1, i):
        if y <= 2**x + 2**k and y >= 2**k:
            print(2**k - 1)
            ok = True
            break
    if ok:
        continue
    print(1)