#include <iostream>

using namespace std;
typedef long long ll;
ll pw(ll a,ll x,ll mod){
    ll ret = 1;
    while(x){
        if(x&1) (ret *= a) %= mod;
        (a *= a) %= mod; x /= 2;
    }
    return ret;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll i,n,m,p,q; cin >> n >> m >> p >> q;
    for(i=0;i<q;i++){
        ll x,f; cin >> x >> f;
        x %= p;
        if(x==0){
            if(f==0){
                cout << m << "\n";
            }else{
                cout << 0 << "\n";
            }
        }else{
            ll y = (pw(x,p - 2,p)*f)%p;
            if(!y){
                cout << (m - y)/p << "\n";
            }else{
                cout << (m - y + p)/p << "\n";
            }
        }
    }
}