using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m, p, q) = (c[0], c[1], c[2], c[3]);
        var ans = new int[q];
        for (var u = 0; u < q; ++u)
        {
            c = NList;
            ans[u] = Country(m, c[0], c[1], p);
        }
        WriteLine(string.Join("\n", ans));
    }
    static int Country(int m, int x, int f, int p)
    {
        var revx = Exp(x, p - 2, p);
        var ex = (int)(f * revx % p);
        if (ex > m) return 0;
        return (m - ex) / p + (ex > 0 ? 1 : 0);
    }
    static int GCD(int a, int b)
    {
        if (a < b) return GCD(b, a);
        if (a % b == 0) return b;
        return GCD(b, a % b);
    }
    static long Exp(long n, long k, int mod)
    {
        if (k == 0) return 1;
        if (k == 1) return n % mod;
        var half = Exp(n, k / 2, mod);
        var result = (half * half) % mod;
        return ((k % 2) == 0) ? result : ((result * n) % mod);
    }
}