N, X = map(int, input().split())
ans = []

if X == 1:
    if N % 4 == 1:
        ans.append(1)
    elif N % 4 == 2:
        ans.append(2)
        ans.append(3)
    elif N % 4 == 3:
        ans.append(3)
        ans.append(4)
        ans.append(6)
    elif N % 4 == 0:
        ans.append(1)
        ans.append(2)
        ans.append(4)
        ans.append(6)
    now = 8
    while len(ans) < N:
        for j in range(4):
            ans.append(now + j)
        now += 4
elif X == 2:
    if N % 4 == 1:
        ans.append(2)
    elif N % 4 == 2:
        ans.append(1)
        ans.append(3)
    elif N % 4 == 3:
        ans.append(3)
        ans.append(6)
        ans.append(7)
    elif N % 4 == 0:
        ans.append(2)
        ans.append(3)
        ans.append(4)
        ans.append(7)
    now = 8
    while len(ans) < N:
        for j in range(4):
            ans.append(now + j)
        now += 4
elif X == 3:
    if N % 4 == 1:
        ans.append(3)
    elif N % 4 == 2:
        ans.append(1)
        ans.append(2)
    elif N % 4 == 3:
        ans.append(1)
        ans.append(4)
        ans.append(6)
    elif N % 4 == 0:
        ans.append(2)
        ans.append(3)
        ans.append(4)
        ans.append(6)
    now = 8
    while len(ans) < N:
        for j in range(4):
            ans.append(now + j)
        now += 4
else:
    if N % 4 == 1:
        ans.append(X)
    elif N % 4 == 2:
        if X % 4 == 0:
            ans.append(X + 1)
            ans.append(1)
        else:
            ans.append(X - X % 4)
            ans.append(X % 4)
    elif N % 4 == 3:
        for j in range(4):
            if j != X % 4:
                ans.append(X - X % 4 + j)
    else:
        ans.append(X)
        ans.append(1)
        ans.append(2)
        ans.append(3)
    now = 4
    while len(ans) < N:
        if now // 4 == X // 4:
            now += 4
            continue
        for j in range(4):
            ans.append(now + j)
        now += 4
# ans.sort()
assert min(ans) >= 1
assert max(ans) <= 100005
assert len(ans) == N
for j in range(len(ans)):
    print(ans[j])