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

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    ll X, Y;
    int N;
    cin >> X >> Y >> N;
    
    rep(query, 0, N) {
        ll U, V;
        cin >> U >> V;
        --U, --V;
        if (U == -1) {
            cout << (V - (V/Y)*Y) + 1 << '\n';
        } else if (U / Y == V / Y) {
            cout << V - U << '\n';
        } else {
            cout << (U - (U/Y)*Y) + (V - (V/Y)*Y) + 2 << '\n';
        }
    }
}