#include <bits/stdc++.h>
#define int long long
#define bp __builtin_popcountll
#define pb push_back
#define in(s) freopen(s, "r", stdin);
#define out(s) freopen(s, "w", stdout);
#define inout(s, end1, end2) freopen((string(s) + "." + end1).c_str(), "r", stdin),\
freopen((string(s) + "." + end2).c_str(), "w", stdout);
#define fi first
#define se second
#define bw(i, r, l) for (int i = r - 1; i >= l; i--)
#define fw(i, l, r) for (int i = l; i < r; i++)
#define fa(i, x) for (auto i: x)
using namespace std;
const int mod = 1e9 + 7, inf = 1061109567;
const long long infll = 4557430888798830399;
const int N = 2e5 + 5;
int n, x[N], y[N], ans = 0, cnt[N][3];
signed main() {
#ifdef BLU
in("blu.inp");
// out("ans1.out");
#endif
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n;
fw (i, 0, n * 2) cin >> x[i] >> y[i];
//x and y are NOT independent (same y same x case)
fw (i, 0, n * 2) {
if (x[i] < 1) {
ans += (1 - x[i]);
x[i] = 1;
} else if (x[i] > n) {
ans += (x[i] - n);
x[i] = n;
}
if (y[i] < 1) {
ans += (1 - y[i]);
y[i] = 1;
} else if (y[i] > 2) {
ans += (y[i] - 2);
y[i] = 2;
}
cnt[x[i]][y[i]]++;
// cout << "cnt[" << x[i] << "][" << y[i] << "] = " << cnt[x[i]][y[i]] << "\n";
}
int prf[3];
prf[1] = prf[2] = 0;
fw (i, 1, n + 1) {
fw (j, 1, 3) {
prf[j] += cnt[i][j] - 1; //Leave 1 coin at current position.
//If there are no coins to be placed prf[j] is negative.
}
fw (j, 1, 3) {
int other = 2;
if (j == 2) other = 1;
if (prf[j] > 0 && prf[other] < 0) {
//Transfer across columns
int transferred = min(prf[j], -prf[other]);
prf[j] -= transferred;
prf[other] += transferred;
ans += transferred;
}
}
fw (j, 1, 3) {
//If prf is negative it needs to be transferred from the right. Add by abs
ans += abs(prf[j]);
}
}
cout << ans;
return 0;
}
