#pragma GCC target("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")

#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
ll modinv(ll A,ll M){
    //A*r+B*n=gcd(A,B)
    A %= M;
    if(A == 0 || __gcd(A,M) != 1){
        //cout << "Error modinv(" << A << "," << M << ")" << endl;
        return -1;
    }
    ll B = M,U = 1,V = 0;
    while(B){
        ll T = A / B;
        A -= T * B;
        swap(A,B);
        U -= T * V;
        swap(U,V);
    }
    U %= M;
    if(U < 0) U += M;
    return U;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll N,M,P,Q;
    cin >> N >> M >> P >> Q;
    for(ll q = 0;q < Q;q++){
        ll x,f;
        cin >> x >> f;
        x %= P;
        if(x == 0){
            if(f == 0) cout << M << endl;
            else cout << 0 << endl;
        }
        else{
            ll y = (f * modinv(x,P)) % P;
            ll ans = M / P;
            if(y != 0 && y <= M % P) ans++;
            cout << ans << endl;
        }
    }
}