#include "bits/stdc++.h"
using namespace std;
// #pragma comment(linker, "/stack:200000000")
// #pragma GCC optimize("Ofast")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
using ll = long long;
using ld = long double;
#define pb push_back
#define ff first
#define ss second
#define sz(x) (ll)(x).size()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
void freopen(string s) { freopen((s+".in").c_str(), "r", stdin); freopen((s+".out").c_str(), "w", stdout); }
void IOIGold2024_InshAllah() { ios_base::sync_with_stdio(false); cin.tie(NULL); }
ll binmul(ll a, ll b, ll c) { ll res = 0; while(b) { if(b&1) (res += a) %= c; (a += a) %= c; b >>= 1; } return res; }
ll binpow(ll a, ll b, ll c) { ll res = 1; while(b) { if(b&1) (res *= a) %= c; (a *= a) %= c; b >>= 1; } return res; }
template<typename T> T gcd(T a, T b) { if(b==0) return a; return gcd(b, a%b); }
template<typename T> T lcm(T a, T b) { return a/gcd(a, b)*b; }
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ld rnd() { return rng()%INT_MAX*1.0/INT_MAX; }
const ll inf = 1e18+7, MX = LLONG_MAX, MN = LLONG_MIN;
const ll mod = 1e9+7, N = 3e5+5;
ll cnt[N][3];
void kigash() {
ll n, ans = 0;
cin>>n;
for(ll i=1; i<=2*n; i++) {
ll x, y, X = -1, Y = -1;
cin>>x>>y;
if(x>=1 && x<=n && y>=2) X = x, Y = 2;
else if(x>=1 && x<=n && y<=1) X = x, Y = 1;
else if(y>=1 && y<=2 && x>=n) X = n, Y = y;
else if(y>=1 && y<=2 && x<=1) X = 1, Y = y;
else if(x<1 && y<1) X = 1, Y = 1;
else if(x<1 && y>2) X = 1, Y = 2;
else if(x>n && y<1) X = n, Y = 1;
else X = n, Y = 2;
cnt[X][Y]++;
ans += abs(X-x)+abs(Y-y);
}
ll sum1 = 0, sum2 = 0;
for(ll i=1; i<=n; i++) {
sum1 += cnt[i][1]-1, sum2 += cnt[i][2]-1;
if(sum1<0 && sum2>0) {
ll mn = min(abs(sum1), abs(sum2));
sum1 += mn, sum2 -= mn, ans += mn;
}
if(sum2<0 && sum1>0) {
ll mn = min(abs(sum1), abs(sum2));
sum1 -= mn, sum2 += mn, ans += mn;
}
ans += abs(sum1)+abs(sum2);
}
cout<<ans<<"\n";
return;
}
signed main(/*Kigash Amir*/) {
// freopen("");
IOIGold2024_InshAllah();
ll tt = 1;
// cin>>tt;
for(ll i=1; i<=tt; i++) {
kigash();
}
}
