#include <bits/stdc++.h>
using namespace std;
#define ll long long
constexpr int maxn = 1e5+2;
int x[2*maxn],y[2*maxn],cnt[2][maxn];
ll ret;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n; cin >> n;
for(int i=1; i<=2*n; i++)
{
cin >> x[i] >> y[i];
int r,c;
if(x[i] <= 1) c=1;
else if(x[i] >= n) c=n;
else c=x[i];
if(y[i] >= 2) r=2;
else r=1;
ret += abs(x[i]-c)+abs(y[i]-r);
cnt[r-1][c]++;
}
int a=0,b=0;
for(int i=1; i<=n; i++)
{
a += cnt[0][i]-1; b += cnt[1][i]-1;
if(a > 0 && b < 0)
{
int c = min(a,-b);
ret+=c, a-=c, b+=c;
}
else if(b > 0 && a < 0)
{
int c = min(-a,b);
ret+=c, a+=c, b-=c;
}
ret += abs(a)+abs(b);
}
cout << ret << '\n';
}
