#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll X, Y, N;
    cin >> X >> Y >> N;
    while (N--) {
        ll U, V;
        cin >> U >> V;
        if (U == 0) {
            cout << (V - 1) % Y + 1 << '\n';
        } else if ((U - 1) / Y == (V - 1) / Y) {
            cout << V - U << '\n';
        } else {
            cout << (V - 1) % Y + 1 + (U - 1) % Y + 1 << '\n';
        }
    }
}