This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define FOR(i, j, k) for(int i=(j); i<=(k); i++)
#define FFOR(i, j, k) for(int i=(j); i<(k); i++)
#define DFOR(i, j, k) for(int i=(j); i>=(k); i--)
#define bug(x) cerr<<#x<<" = "<<(x)<<'\n'
#define pb push_back
#define mp make_pair
#define bit(s, i) (((s)>>(i))&1LL)
#define mask(i) ((1LL<<(i)))
#define builtin_popcount __builtin_popcountll
#define __builtin_popcount __builtin_popcountll
using ll=long long; using ld=long double;
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); const ld pi=acos(0)*2;
template <typename T> inline void read(T &x){char c; bool nega=0; while((!isdigit(c=getchar()))&&(c!='-')); if(c=='-'){nega=1; c=getchar();} x=c-48; while(isdigit(c=getchar())) x=x*10+c-48; if(nega) x=-x;}
template <typename T> inline void writep(T x){if(x>9) writep(x/10); putchar(x%10+48);}
template <typename T> inline void write(T x){if(x<0){ putchar('-'); x=-x;} writep(x);}
template <typename T> inline void writeln(T x){write(x); putchar('\n');}
#define taskname "Coin"
int n;
int x[200001];
int y[200001];
int c[100001][3];
int main(){
#ifdef Aria
if(fopen(taskname".in", "r"))
freopen(taskname".in", "r", stdin);
#endif // Aria
read(n);
FOR(i, 1, n*2) read(x[i]), read(y[i]);
ll ans=0;
FOR(i, 1, n*2){
if(x[i]<1){
ans+=1-x[i];
x[i]=1;
}
else if(x[i]>n){
ans+=x[i]-n;
x[i]=n;
}
if(y[i]<1){
ans+=1-y[i];
y[i]=1;
}
else if(y[i]>2){
ans+=y[i]-2;
y[i]=2;
}
}
FOR(i, 1, n*2) c[x[i]][y[i]]++;
int d[3]={0, 0, 0};
FOR(i, 1, n){
d[1]+=c[i][1]-1;
d[2]+=c[i][2]-1;
if(d[1]>0&&0>d[2]){
int t=min(d[1], -d[2]);
d[1]-=t;
d[2]+=t;
ans+=t;
}
if(0>d[1]&&d[2]>0){
int t=min(-d[1], d[2]);
d[1]+=t;
d[2]-=t;
ans+=t;
}
ans+=abs(d[1]);
ans+=abs(d[2]);
}
writeln(ans);
}
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