#include <bits/stdc++.h>
using namespace std;
#define int long long
int n;
int a[100005], b[100005];
int32_t main() {
	ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	cin >> n;
	for (int i = 0; i < n + n; i++) cin >> a[i] >> b[i];
	sort(a, a + n + n);
	sort(b, b + n + n);
	int ans = 0;
	for (int i = 0; i < n + n; i++) {
	  ans += abs(a[i] - (i / 2 + 1));
	  ans += abs(b[i] - (i / n + 1));
	}
	cout << ans;
}
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