#include <bits/stdc++.h>
#define ff first
#define ss second
#define endl '\n'
using namespace std;
const long long INF = (long long) 1e18;
const int mod = (int) 1e9+7;
const int MAXN = (int) 3e5+5;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll n;
int gr[MAXN][2];
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);cout.tie(nullptr);
#ifdef Local
freopen("C:/Users/Admin/Desktop/Yazilim/C/IO/int.txt","r",stdin);
freopen("C:/Users/Admin/Desktop/Yazilim/C/IO/out.txt","w",stdout);
#endif
cin>>n;
ll ans = 0;
for(int i = 0; i < 2*n; i++){
int x, y;
cin>>x>>y;
if(x >= 1 && x <= n){
if(y <= 1){
gr[x][0]++;
ans += (1 - y);
}else{
gr[x][1]++;
ans += (y - 2);
}
}else{
if(x < 1){
if(y <= 1){
gr[1][0]++;
ans += (1 - x + 1 - y);
}else{
gr[1][1]++;
ans += (1 - x + y - 2);
}
}else if(x > n){
if(y <= 1){
gr[n][0]++;
ans += (x - n + 1 - y);
}else{
gr[n][1]++;
ans += (x - n + y - 2);
}
}
}
}
int usd = 0, ald = 0;
for(int i = 1; i <= n; i++){
usd += gr[i][0] - 1;
ald += gr[i][1] - 1;
if(usd < 0 && ald > 0){
int c = min(-usd, ald);
usd += c;
ald -= c;
ans += c;
}else if(usd > 0 && ald < 0){
int c = min(usd, -ald);
usd -= c;
ald += c;
ans += c;
}
ans += abs(usd) + abs(ald);
}
cout<<ans<<endl;
#ifdef Local
cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
#endif
}
