#include<bits/stdc++.h>
#define int long long
#define I128 //||is_same<T,__int128_t>::value||is_same<T,__uint128_t>::value
using namespace std;
template<typename T>enable_if_t<is_integral<T>::value I128,void> readmain(T &x)
{
bool neg=false;int c=getchar();
for(;!isdigit(c);c=getchar())if(c=='-')neg=true;
for(x=0;isdigit(c);c=getchar())x=(T)(10*x+(c-'0'));
if(neg)x=-x;
}
template<typename T>T& read(T &x){readmain(x);return x;}
template<typename T,typename ...Tr>void read(T &x,Tr&... r){readmain(x);read(r...);}
constexpr int maxn = 2e5 + 9, mod = 1e9 + 7, L = 1e8;
void solve(){
int n;
read(n);
vector <int> x(2 * n + 1), y(2 * n + 1);
for(int i = 1; i <= 2 * n; i++) {
read(x[i], y[i]);
}
int ans = 0;
for(int i = 1; i <= 2 * n; i++) {
if(1 <= x[i] && x[i] <= n) {
if(2 <= y[i]){
ans += y[i] - 2ll;
y[i] = 2;
}
else{
ans += 1ll - y[i];
y[i] = 1;
}
}
else{
if(2 <= y[i]) {
ans += y[i] - 2ll;
y[i] = 2;
}
else{
ans += 1ll - y[i];
y[i] = 1;
}
if(x[i] < 1) {
ans += 1ll - x[i];
x[i] = 1;
}
else{
ans += x[i] - n;
x[i] = n;
}
}
}
multiset <int> s1, s2;
for(int i = 1; i <= 2 * n; i++) {
if(y[i] == 1) {
s1.insert(x[i]);
}
else{
s2.insert(x[i]);
}
}
for(int i = 1; i <= 2 * n; i++) {
int X = (i + 1) / 2, Y = i & 1;
if(!Y){
Y = 2;
}
int l1 = mod, r1 = mod;
int l2 = mod, r2 = mod;
if(!s1.empty()){
auto it = lower_bound(s1.begin(), s1.end(), X);
if(it != s1.end()){
r1 = *it;
r1 = abs(r1 - X);
}
if(it != s1.begin()){
it--;
l1 = *it;
l1 = abs(l1 - X);
}
}
if(!s2.empty()) {
auto it = lower_bound(s2.begin(), s2.end(), X);
if(it != s2.end()) {
r2 = *it;
r2 = abs(r2 - X);
}
if(it != s2.begin()){
it--;
l2 = *it;
l2 = abs(l2 - X);
}
}
if(Y == 1) {
l2++;
r2++;
}
if(Y == 2){
l1++;
r1++;
}
int mn = min({l1, r1, l2, r2});
ans += mn;
if(mn == l1) {
auto it = lower_bound(s1.begin(), s1.end(), X);
it--;
s1.erase(it);
}
else if(mn == r1){
auto it = lower_bound(s1.begin(), s1.end(), X);
s1.erase(it);
}
else if(mn == l2){
auto it = lower_bound(s2.begin(), s2.end(), X);
it--;
s2.erase(it);
}
else{
auto it = lower_bound(s2.begin(), s2.end(), X);
s2.erase(it);
}
}
printf("%lld", ans);
}
int32_t main(){
//ios_base::sync_with_stdio(false);
//cin.tie(nullptr);
int tt = 1;
//cin >> tt;
while(tt--) {
solve();
}
}
