// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

int main() {
    std::ios::sync_with_stdio(false);
    ll x, y, n; cin >> x >> y >> n;
    while(n --) {
        ll u, v; cin >> u >> v;
        u --; v --;
        ll ans = 0;
        if(u == -1)
            ans = v % y + 1;
        else {
            ll a = u % y, b = v % y;
            if(u / y == v / y)
                ans = std::abs(a - b);
            else
                ans = a + b + 2;
        }
        cout << ans << '\n';
    }
}