#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define X first
#define Y second
#define all(x) x.begin(),x.end()
#define sz(x) (int)x.size()
#define pb emplace_back
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n; cin >> n;
vector<int> row;
vector<int> col;
for(int i = 0 ; i < n + n ; ++i) {
int x; cin >> x;
int y; cin >> y;
row.pb(x);
col.pb(y);
}
sort(row.begin(),row.end());
sort(col.begin(),col.end());
ll ans = 0;
for(int i = 0 ; i < n + n ; ++i) ans += abs(row[i] - 1 - (i / 2));
for(int i = 0 ; i < n + n ; ++i) ans += abs(col[i] - 2 + (i < n));
cout << ans << endl;
}
