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.

<image>

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
import java.awt.geom.*;
import java.io.*;
import java.math.*;
import java.util.*;
import java.util.regex.*;
import static java.lang.Math.*;
public class A {

    public A() throws Exception {
        long a = in.nextInt();
        long b = in.nextInt();
        int n = in.nextInt();
        for (int i=1; i<=n; i++) {
            long l = in.nextInt();
            long t = in.nextInt();
            long m = in.nextInt();

            long lower = l;  //TODO
            long upper = l+t;
            while (lower<upper) {
                long mid = (lower+upper)/2;
                long r = mid;
                long lh = a+(l-1)*b;
                long rh = a+(mid-1)*b;
                long total = (lh+rh)*(r-l+1)/2;
                if (rh>t || total>m*t) upper = mid;
                else lower = mid+1;
            }

            if (lower-1<l) buf.append("-1\n");
            else buf.append(lower-1).append('\n');
        }
    }

    public static Scanner in = new Scanner(System.in);
    public static StringBuilder buf = new StringBuilder();
    public static void debug(Object... arr) { // {{{
        System.err.println(Arrays.deepToString(arr));
    } // }}}
    public static void main(String[] args) throws Exception { // {{{
        new A();
        System.out.print(buf);
    } // }}}
    public static class Scanner { // {{{
        BufferedReader br;
        String line;
        StringTokenizer st;
        public Scanner(InputStream in) {
            br = new BufferedReader(new InputStreamReader(in));
        }
        public boolean hasNext() throws IOException {
            while ((st==null||!st.hasMoreTokens())&&(line=br.readLine())!=null)
                st = new StringTokenizer(line);
            return st.hasMoreTokens();
        }
        public String next() throws IOException {
            if (hasNext()) return st.nextToken();
            throw new NoSuchElementException();
        }
        public int nextInt() throws IOException {
            return Integer.parseInt(next());
        }
        public long nextLong() throws IOException {
            return Long.parseLong(next());
        }
        public double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }
    } // }}}
}
