using namespace std;
#include<bits/stdc++.h>
void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); cout<<fixed<<setprecision(15);_main(); return 0;}
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef long double ld;
template<class ll> inline bool chmax(ll& a, ll b) { if (a < b) { a = b; return 1; } return 0; }
template<class ll> inline bool chmin(ll& a, ll b) { if (a > b) { a = b; return 1; } return 0; }
#define rep(i, star,fini) for (int i = star; i < fini; i++)
#define ALL(x) std::begin(x), std::end(x)
#define INF ((1LL<<62)-(1LL<<31))
#define bit(x,i)(((x)>>(i))&1)
long double distance(long double xi,long double yi,long double xj,long double yj){return sqrt(1.0*((xi-xj)*(xi-xj))+1.0*((yi-yj)*(yi-yj)));}
ll n,m,p,q;
long long modpow(long long a, long long n) {
    ll mod = p;
    long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % mod;
        a = a * a % mod;
        n >>= 1;
    }
    return res;
}
// a^{-1} mod を計算する
long long modinv(long long a) {
    return modpow(a, p - 2);
}

void _main(){
    cin >> n >> m >> p >> q;
    while (q--)
    {
        ll x,f;cin >> x >> f;
        ll xwf = (x%p)*modinv(f)%p;
        ll g_xwf = modinv(xwf);
        assert(f!=0);
        if(g_xwf>m){
            cout<<0<<endl;
            continue;
        }
        cout<<max(0ll,m-g_xwf+1)/p+1-(g_xwf==0)<<endl;
    }
    
}