#include "bits/stdc++.h"
using namespace std;
using ll = long long;
int main() {
cin.tie(0)->sync_with_stdio(0);
int n;
cin >> n;
vector cnt(3, vector(n + 5, 0));
ll ans = 0;
for (int i = 1; i <= 2 * n; i++) {
ll x, y;
cin >> x >> y;
ll tarx, tary;
if (x >= 1 && x <= n) {
tarx = x;
}
else {
if (x < 1) tarx = 1;
else tarx = n;
}
if (y >= 1 && y <= 2) {
tary = y;
}
else {
if (y < 1) tary = 1;
else tary = 2;
}
++cnt[tary][tarx];
ans += abs(x - tarx) + abs(y - tary);
}
int diff1 = 0;
int diff2 = 0;
for (int i = 1; i <= n; i++) {
diff1 += cnt[1][i] - 1;
diff2 += cnt[2][i] - 1;
if (diff1 > 0 && diff2 < 0) {
int d = min(diff1, -diff2);
ans += d;
diff1 -= d;
diff2 += d;
}
else if (diff1 < 0 && diff2 > 0) {
int d = min(diff2, -diff1);
ans += d;
diff1 += d;
diff2 -= d;
}
ans += abs(diff1) + abs(diff2);
}
cout << ans << endl;
}
