#include <bits/stdc++.h>
using namespace std;

int main() {
    long long n, m, p;
    int q;
    cin >> n >> m >> p >> q;
    for (int i = 0; i < q; i++) {
        int x;
        long long f;
        cin >> x >> f;
        long long start_index = -1;
        for (int y = 1; y < p+1; y++) {
            long long c = (x * y) % p;
            if (c == f) {
                start_index = y;
                break;
            }
        }
        if (start_index == -1) {
            cout << 0 << endl;
            continue;
        }
        long long show = m / p;
        if (m % p >= start_index) {
            show += 1;
        }
        cout << show << endl;
    }
}