#include <bits/stdc++.h>
#include <atcoder/modint>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for(int i = (s); i < (int)(n); i++)
#define printYN(check) cout << ((check)? "Yes" : "No") << endl
#define NUM 998244353
#define IMAX INT_MAX
#define LMAX LONG_MAX
using namespace std;
using namespace atcoder;
using mint = modint;
using vi = vector<int>;
using vvi = vector<vi>;
using ll = long long;
using vl = vector<ll>;
using vvl = vector<vl>;
using vs = vector<string>;
using vb = vector<bool>;
using vvb = vector<vb>;
using pii = pair<int, int>;
using vpii = vector<pii>;
using tii = tuple<int, int, int>;
using mii = map<int, int>;
using Graph = vvi;
// Graph graph(n);
// vi dx = {-1, 0, 1, -1, 1, -1,  0, 1};
// vi dy = { 1, 1, 1,  0, 0, -1, -1,-1};
// snippet -> {UnionFind, dfs_reculsive, dfs_stack, is_prime, mypow, 
//              bfs_queue, digsum, binary_search, gcd, Dijkstra, bitsearch}
// -------------------------------------------------------------------------

int main() {
    int n, m, p, q;
    cin >> n >> m >> p >> q;
    int cy = m / p;  // cycle y
    mint::set_mod(p);
    int y = m % p;
    rep(t, q) {
        int x, f;
        cin >> x >> f;
        int ans = cy;
        mint limy;
        if(f != 0) {
            limy = f;
            limy /= x;
            if(limy.val() <= y) ans++;
        }
        cout << ans << endl;
    }
    return 0;
}