x,y,n = map(int,input().split())
for _ in range(n):
    u, v = map(int,input().split())
    cnt_u = 0
    cnt_v = 0
    while u > y:
        u -= y
        cnt_u += 1
    while v > y:
        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)