#include <bits/stdc++.h>
using namespace std;
#define EmiliaMyWife ios::sync_with_stdio(0); cin.tie(0);
using ll = int64_t;
using ull = uint64_t;
using uint = uint32_t;
using ld = long double;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
const ll LINF = ll(4e15) + ll(2e15);
const double EPS = 1e-9;
static int LamyIsCute = []() {
EmiliaMyWife
return 48763;
}();
signed main() {
int n;
cin >> n;
vector<int> arr(n + 1), brr(n + 1);
ll ans = 0;
for(int i = 0; i < n * 2; i++) {
int x, y;
cin >> x >> y;
int a = max(1, min(n, x)), b = max(1, min(2, y));
ans += abs(a - x) + abs(b - y);
if(b == 1)
arr[a]++;
else
brr[a]++;
}
for(int i = 1, a = 0, b = 0; i <= n; i++) {
a += arr[i] - 1;
b += brr[i] - 1;
int k = min(abs(a), abs(b));
if(a > 0 && b < 0)
a -= k, b += k, ans += k;
if(a < 0 && b > 0)
a += k, b -= k, ans += k;
ans += abs(a) + abs(b);
}
cout << ans << '\n';
}
