#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll calculateInitialMoves(ll x, ll y, ll n) {
ll moves = 0;
if (x < 1) {
moves += (1 - x);
} else if (x > n) {
moves += (x - n);
}
if (y < 1) {
moves += (1 - y);
} else if (y > 2) {
moves += (y - 2);
}
return moves;
}
pair<ll, ll> getValidCoords(ll x, ll y, ll n) {
if (x < 1) x = 1;
else if (x > n) x = n;
if (y < 1) y = 1;
else if (y > 2) y = 2;
return {x, y};
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n;
cin >> n;
vector<vector<int>> coins(n + 1, vector<int>(3, 0));
ll totalMoves = 0;
for (int i = 0; i < 2 * n; i++) {
ll x, y;
cin >> x >> y;
totalMoves += calculateInitialMoves(x, y, n);
auto [validX, validY] = getValidCoords(x, y, n);
coins[validX][validY]++;
}
for (int i = 1; i <= n; i++) {
coins[i][1]--;
coins[i][2]--;
}
int extra1 = 0, extra2 = 0;
for (int i = 1; i <= n; i++) {
extra1 += coins[i][1];
extra2 += coins[i][2];
if (extra1 > 0 && extra2 < 0) {
int transfer = min(extra1, -extra2);
totalMoves += transfer;
extra1 -= transfer;
extra2 += transfer;
} else if (extra2 > 0 && extra1 < 0) {
int transfer = min(extra2, -extra1);
totalMoves += transfer;
extra2 -= transfer;
extra1 += transfer;
}
if (i == n || (extra1 != 0 || extra2 != 0)) {
totalMoves += abs(extra1) + abs(extra2);
extra1 = 0;
extra2 = 0;
}
}
cout << totalMoves << "\n";
return 0;
}
