#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define ss second
#define ff first
const int N=4e5+5;
int cnt[N][4];
signed main(){
int n;
cin>>n;
int ans=0;
for(int i=1;i<=n*2;i++){
int x,y;
cin>>x>>y;
if(x<1){
ans+=1-x;
x=1;
}
if(x>n){
ans+=x-n;
x=n;
}
if(y<1){
ans+=1-y;
y=1;
}
if(y>2){
ans+=y-2;
y=2;
}
cnt[x][y]++;
}
int a=0, b=0;
for (int i = 1; i <= n; i++) {
a+=cnt[i][1]-1;
b+=cnt[i][2]-1;
while (a<0 and b>0)a++,b--,ans++;
while (a>0 and b<0)a--,b++,ans++;
ans += abs(a) + abs(b);
}
cout<<ans;
}
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