#include <bits/stdc++.h>
#define ll long long
using namespace std;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
vector<vector<ll>> freq(n+1, vector<ll>(2));
ll res = 0;
for (int i=1; i<=2*n; i++) {
ll x,y;
cin >> x >> y;
ll x1 = max(1LL, min(n, x));
ll y1 = max(1LL, min(2LL, y));
res+=abs(x-x1)+abs(y-y1);
freq[x1][y1-1]++;
}
ll s1 = 0;
ll s2 = 0;
for (int i=1; i<=n; i++) {
if (freq[i][0]==0) s1--;
else s1+=freq[i][0]-1;
if (freq[i][1]==0) s2--;
else s2+=freq[i][1]-1;
if (s1<0 && s2>0) {
ll m = min(abs(s1), s2);
res+=m;
s1+=m;
s2-=m;
} else if (s1>0 && s2<0) {
ll m = min(s1, abs(s2));
res+=m;
s2+=m;
s1-=m;
}
res+=abs(s1)+abs(s2);
}
cout << res;
}
