X, Y, N = (int(x) for x in input().split())
for _ in range(N):
    U, V = (int(x) for x in input().split())
    if U == 0:
        print((V - 1) % Y + 1)
    elif V == 0:
        print((U - 1) % Y + 1)
    elif (U - 1) // Y == (V - 1) // Y:
        print(abs(U - V))
    else:
        print((U - 1) % Y + (V - 1) % Y + 2)