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

ll llceil(ll a, ll b){
  return (a + b - 1) / b;
}

ll mod(ll a, ll b){
  ll ans = a % b;
  if(ans == 0){
    return b;
  }
  return ans;
}

int main () {
  ll x,y,n;
  cin >> x >> y >> n;
  for(ll i = 0; i < n; i++){
    ll u,v;
    cin >> u >> v;
    if(u == 0){
      cout << mod(v, y) << endl;
    } else {
      ll u_id = llceil(u, y);
      ll v_id = llceil(v, y);
      if(u_id == v_id){
        cout << v - u << endl;
      } else {
        cout << mod(u, y) + mod(v, y) << endl;
      }
    }
  }
}