#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << " " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << " " << j << " " << #i << " " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
typedef pair<int,pii>pi2;
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
void solve(){
int n;
cin >> n;
pii arr[2*n];
vector<int>v;
vector<int>v2;
for(int x=0;x<2*n;x++){
cin >> arr[x].first >> arr[x].second;
v.push_back(arr[x].first);
v2.push_back(arr[x].second);
}
sort(v.begin(),v.end());
sort(v2.begin(),v2.end());
//show4(v,v);
//show4(v2,v2);
int counter=0;
for(int x=0;x<n;x++){
counter+=abs(v[2*x]-(x+1));
counter+=abs(v[2*x+1]-(x+1));
counter+=abs(v2[x]-1);
counter+=abs(v2[x+n]-2);
}
cout << counter;
}
int32_t main(){
ios::sync_with_stdio(0);
cin.tie(0);
//freopen("in.txt","r",stdin);
//freopen("in.txt","w",stdout);
int t=1;
//cin >> t;
while(t--){
solve();
}
}
