#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main() {
int n; cin >> n;
array<vector<int>, 2> a = {
vector<int>(n, -1),
vector<int>(n, -1)
};
int ans = 0;
for (int i = 0; i < 2 * n; i++) {
int x, y; cin >> x >> y; x--; y--;
int xx = min(max(x, 0LL), n - 1);
int yy = min(max(y, 0LL), 1LL);
ans += abs(x - xx) + abs(y - yy);
a[yy][xx]++;
}
int s[2]{};
for (int i = 0; i < n; i++) {
s[0] += a[0][i];
s[1] += a[1][i];
if (s[0] < 0 && s[1] > 0) {
int d = min(s[1], -s[0]);
ans += d;
s[0] += d;
s[1] -= d;
}
if (s[0] > 0 && s[1] < 0) {
int d = min(s[0], -s[1]);
ans += d;
s[0] -= d;
s[1] += d;
}
ans += abs(s[0]);
ans += abs(s[1]);
}
cout << ans << endl;
return 0;
}
