#include <bits/stdc++.h>
using namespace std;
int main () {
	int N;
	cin >> N;
	int X[2020], Y[2020];
	for (int i = 0; i < N; i ++) cin >> X[i] >> Y[i];
	sort(X, X + N);
	sort(Y, Y + N);
	int ans = 0;
	for (int i = 0; i < N; i ++) {
		ans += abs(X[i] - X[N - 1 - i]) + abs(Y[i] - Y[N - 1 - i]);
	}
	cout << ans / 2 << endl;
}