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

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rrep(i,n) for(int i=(int)(n-1);i>=0;i--)
#define ALL(v) v.begin(),v.end()
#define RALL(v) v.rbegin(),v.rend()
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;
using u128=__int128_t;
using ll=long long;
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll x,y,n;
  cin>>x>>y>>n;
  while(n--){
    ll u,v;
    cin>>u>>v;
    if(u==0) cout<<(v-1)%y+1<<'\n';
    else if((u-1)/y==(v-1)/y) cout<<v-u<<'\n';
    else cout<<(u-1)%y+(v-1)%y+2<<'\n';
  }
    
  return 0;
}