#include <cmath>
#include <fstream>
#include <iostream>
using namespace std;

const int MAXN = 50005;

int X[MAXN], Y[MAXN], Z[MAXN];

int main()
{
    ifstream cin("inundatii.in");
    ofstream cout("inundatii.out");
    int N;
    long long ans = 0;
    cin >> N;
    for(int i = 1; i <= N; ++i)
      cin >> X[i] >> Y[i] >> Z[i];
    for(int i = 1; i <= N; ++i) {
      ans += abs(X[i] - (X[(N + 1) / 2] - (N + 1) / 2 + i));
      ans += abs(Y[i] - (Y[(N + 1) / 2] - (N + 1) / 2 + i));
      ans += abs(Z[i] - (Z[(N + 1) / 2] - (N + 1) / 2 + i));
    }
    cout << ans;
    return 0;
}