Karafs is some kind of vegetable in shape of an 1 × h rectangle. Tavaspolis people love Karafs and they use Karafs in almost any kind of food. Tavas, himself, is crazy about Karafs.

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Each Karafs has a positive integer height. Tavas has an infinite 1-based sequence of Karafses. The height of the i-th Karafs is si = A + (i - 1) × B.

For a given m, let's define an m-bite operation as decreasing the height of at most m distinct not eaten Karafses by 1. Karafs is considered as eaten when its height becomes zero.

Now SaDDas asks you n queries. In each query he gives you numbers l, t and m and you should find the largest number r such that l ≤ r and sequence sl, sl + 1, ..., sr can be eaten by performing m-bite no more than t times or print -1 if there is no such number r.

Input

The first line of input contains three integers A, B and n (1 ≤ A, B ≤ 106, 1 ≤ n ≤ 105).

Next n lines contain information about queries. i-th line contains integers l, t, m (1 ≤ l, t, m ≤ 106) for i-th query.

Output

For each query, print its answer in a single line.

Examples

Input

2 1 4
1 5 3
3 3 10
7 10 2
6 4 8


Output

4
-1
8
-1


Input

1 5 2
1 5 10
2 7 4


Output

1
2
A, B, n = map(int, raw_input().split())
a = [map(int,raw_input().split())for _ in xrange(n)]

for i in xrange(n):
    l, t, m = a[i]
    lo, hi = l, t
    sl = A + (lo - 1) * B
    ans = -1
    while lo <= hi:
        mid = (lo + hi) / 2
        smid = A + (mid - 1) * B
        tst = (mid - l + 1) * (sl + smid) / 2
        if smid <= t and tst <= t * m:
            ans = mid
            lo = mid + 1
        else:
            hi = mid - 1
    print ans