#include<bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) x.begin()+1, x.end()
#define F first
#define S second
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll cnt[100010][3];
int main() {
speed;
ll n;
cin>>n;
ll ans=0;
memset(cnt,0,sizeof(cnt));
for (ll i=1;i<=2*n;i++) {
ll x,y;
cin>>x>>y;
if (x<=1) {
if (y<=1) {
ans+=(1-x)+(1-y);
cnt[1][1]++;
} else {
cnt[1][2]++;
ans+=(1-x)+(y-2);
}
} else if (n<=x) {
if (y<=1) {
cnt[n][1]++;
ans+=(x-n)+(1-y);
} else {
cnt[n][2]++;
ans+=(x-n)+(y-2);
}
} else {
if (y<=1) {
cnt[x][1]++;
ans+=(1-y);
} else {
cnt[x][2]++;
ans+=(y-2);
}
}
}
ll d1=0,d2=0;
for (int i=1;i<=n;i++) {
d1+=cnt[i][1]-1;
d2+=cnt[i][2]-1;
// cout<<d1<<" "<<d2<<" 1\n";
if (d1<0 and 0<d2) {
ll t=min(-d1,d2);
ans+=t;
d1+=t;
d2-=t;
} else if (d2<0 and 0<d1) {
ll t=min(d1,-d2);
ans+=t;
d1-=t;
d2+=t;
}
ans+=abs(d1)+abs(d2);
// cout<<d1<<" "<<d2<<" 2\n\n";
}
cout<<ans<<"\n";
return 0;
}
