#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)
#define all(x) begin(x), end(x)

template <class T> bool chmin(T& x, T y) {
	return x > y ? (x = y, true) : false;
}
template <class T> bool chmax(T& x, T y) {
	return x < y ? (x = y, true) : false;
}

struct io_setup {
	io_setup() {
		ios::sync_with_stdio(false);
		cin.tie(nullptr);
		cout << fixed << setprecision(15);
	}
} io_setup;

void solve() {
	int x, y, n;
	cin >> x >> y >> n;
	rep(i, 0, n) {
		ll u, v;
		cin >> u >> v;
		if (u == 0) {
			cout << (v - 1) % y + 1 << "\n";
		} else {
			u--, v--;
			if (u / y == v / y) {
				cout << (v - u) << "\n";
			} else {
				cout << u % y + v % y + 2 << "\n";
			}
		}
	}
}

int main() {
	int t = 1;
	// cin >> t;
	while (t--) solve();
}