#include <iostream>
#include <iomanip>//小数点出力用
//cout << fixed << setprecision(10) << ans;
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <unordered_map>
using ll = long long;
using namespace std;
#define modPHash (ll)((1LL<<61)-1)
#define modP (ll)998244353
bool chkrng0idx(int pos, int sup) { return (0 <= pos && pos < sup); }
int clk4(int num) { return (num - 2) * (num % 2); }
void yn(bool tf) { cout << (tf ? "Yes\n" : "No\n"); }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	ll X, Y, N;
	cin >> X >> Y >> N;
	while (N--) {
		ll U, V;
		cin >> U >> V;
		if (U == 0) {
			cout << (V - 1LL) % Y + 1LL << endl;
		}
		else {
			if ((U - 1LL) / Y == (V - 1LL) / Y) {
				cout << V - U << endl;
			}
			else {
				cout << (U - 1LL) % Y + (V - 1LL) % Y + 2LL << endl;
			}
		}
	}
	return 0;
}