#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define ALL(a) (a).begin(), (a).end()
#define Yes cout << "Yes" << endl
#define No cout << "No" << endl
#define endl '\n'

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll X, Y, N;
    cin >> X >> Y >> N;
    for (; N--;) {
        ll U, V;
        cin >> U >> V;
        ll ans;
        if ((U - 1) / Y == (V - 1) / Y) {
            ans = abs(((U % Y == 0 && U != 0) ? Y : U % Y) -
                      ((V % Y == 0 && V != 0) ? Y : V % Y));
        } else {
            ans = ((U % Y == 0 && U != 0) ? Y : U % Y) +
                  ((V % Y == 0 && V != 0) ? Y : V % Y);
        }
        cout << ans << endl;
    }
}