x,y,n = map(int,input().split())
for _ in range(n):
    u, v = map(int,input().split())
    cnt_u = 0
    cnt_v = 0
    if u > y:
        cnt_u += u // y
        u %= y
        if u == 0:
            u += y
            cnt_u -= 1
    if v > y:
        cnt_v += v // y
        v %= y
        if v == 0:
            v += y
            cnt_v -= 1
    # print("---")
    # print(u)
    # print(v)
    # print(cnt_u)
    # print(cnt_v)

    if u == 0 or v == 0:
        print(abs(u - v))
    elif cnt_u == cnt_v:
        print(abs(u - v))
    else:
        print(u + v)