#include <bits/stdc++.h>
using namespace std;
using ll=long long;
ll N,M,P,Q,X,F;
ll mp(ll a,ll n){
    a%=P;
    if(n==0)return 1;
    else if(n%2==1)return (a*mp(a,n-1))%P;
    else {
        ll r=mp(a,n/2);
        return (r*r)%P;
    }
}
int main() {
    cin>>N>>M>>P>>Q;
    while(cin>>X>>F){
        if(X%P==0){
            if(F==0)cout<<M<<endl;
            else cout<<0<<endl;
            continue;
        }
        ll y=(F*mp(X,P-2))%P;
        cout<<M/P+(M>=y&&y!=0)<<endl;
    }
}