#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
int dist(pii a, pii b){
return abs(a.first-b.first) + abs(a.second-b.second);
}
signed main(){
ios::sync_with_stdio(false);
cin.tie(NULL);
//ifstream cin(".in");
//ofstream cout(".out");
in(n);
n *= 2;
vpii v;
f0r(i,n){
in2(a,b);
v.pb(mp(a,b));
}
sort(all(v));
vvi dp(n, vi(n/2+1,4e18));
dp[0][0] = dist(v[0], mp(1,2));
dp[0][1] = dist(v[0], mp(1,1));
FOR(i, 1, n){
int ub = min(n/2+1, i+2);
int lb = (i < n/2) ? 0 : i-n/2+1;
//out3(i,lb,ub);
for(int j = lb; j<ub; j++){
int a = j;
int b = i - j;
dp[i][j] = dp[i-1][a] + dist(mp(b+1,2),v[i]);
if(a > 0){
dp[i][j] = min(dp[i][j], dp[i-1][a-1] + dist(mp(a,1), v[i]));
}
}
}
/*
f0r(i,n){
vout(dp[i]);
}
*/
out(dp[n-1][n/2]);
}
