def readint():
    return map(int, input().split())


x, y, n = readint()
uv = [tuple(readint()) for _ in range(n)]
for u, v in uv:
    u0, v0 = 0, 0
    if u != 0:
        u0 = y if u % y == 0 else u % y
    if v != 0:
        v0 = y if v % y == 0 else v % y
    if u0 == 0 or v0 == 0:
        print(abs(u0 - v0))
    elif (u - 1) // y == (v - 1) // y:
        print(abs(u0 - v0))
    else:
        print(abs(u0 + v0))