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

inline constexpr long long ModInv(long long a, const long long p) noexcept {
    long long b = p, u = 1, v = 0;
    while (b) {
        long long t = a / b;
        a -= t * b; std::swap(a, b);
        u -= t * v; std::swap(u, v);
    }
    u %= p; 
    if (u < 0) u += p;
    return u;
}

inline constexpr long long mod(const long long a, const long long m) noexcept {
    return (a % m + m) % m;
}

int main() {
    long long n, m, p, q;
    cin >> n >> m >> p >> q;
    while (q--) {
        long long x, f;
        cin >> x >> f;
        auto y = mod((mod(f, p) * ModInv(x, p)) - 1, p);
        cout << m / p + (y <= mod(m - 1, p)) << endl;   
    }
}