X, Y, N = map(int, input().split())
ans = []
for _ in range(N):
    u, v = map(int, input().split())
    s = (u - 1) // Y
    t = (v - 1) // Y
    if s == t:
        ans.append(abs(u - v))
    else:
        temp = u - s * Y + v - t * Y
        if u == 0:
            temp = v - t * Y
        ans.append(temp)
print(*ans, sep="\n")