#include<bits/stdc++.h>
using namespace std;
const int MAXN=2e3+5;
const long long INF=1e18;
pair<long long,long long> A[MAXN];
long long dp[MAXN][MAXN];
long long manhattan(pair<long long,long long> a,pair<long long,long long> b)
{
return abs(a.first-b.first)+abs(a.second-b.second);
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin>>n;
for(int i=1;i<=n*2;i++) cin>>A[i].first>>A[i].second;
sort(A+1,A+n*2+1);
for(int i=0;i<=n;i++) for(int j=0;j<=n;j++) if(i==0&&j==0) dp[i][j]=0;
else
{
dp[i][j]=INF;
if(i) dp[i][j]=min(dp[i][j],dp[i-1][j]+manhattan(A[i+j],(pair<long long,long long>){i,1}));
if(j) dp[i][j]=min(dp[i][j],dp[i][j-1]+manhattan(A[i+j],(pair<long long,long long>){j,2}));
}
cout<<dp[n][n];
}
