#include "bits/stdc++.h"
using namespace std;
#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
vector<int> x(n * 2), y(n * 2);
for (int i = 0; i < n * 2; ++i) {
cin >> x[i] >> y[i];
}
long long ans = 0;
vector<vector<int>> p(n + 1, vector<int> (3));
for (int i = 0; i < n * 2; ++i) {
int nxtx = 0, nxty = 0;
if (1 <= x[i] && x[i] <= n) {
nxtx = x[i];
} else if (x[i] < 1) {
nxtx = 1;
} else {
nxtx = n;
}
if (y[i] <= 1) {
nxty = 1;
} else {
nxty = 2;
}
ans += abs(x[i] - nxtx);
ans += abs(y[i] - nxty);
p[nxtx][nxty]++;
}
int up = 0, down = 0;
for (int i = 1; i <= n; ++i) {
up += p[i][2] - 1;
down += p[i][1] - 1;
if (up > 0 && down < 0) {
int t = min(up, -down);
ans += t;
up -= t;
down += t;
} else if (up < 0 && down > 0) {
int t = min(-up, down);
ans += t;
up += t;
down -= t;
}
ans += abs(up) + abs(down); //one step to the right
}
cout << ans << '\n';
return 0;
}
