#include <bits/stdc++.h>

#define NMAX 50005
using namespace std;

ifstream fin("inundatii.in");
ofstream fout("inundatii.out");

int x[NMAX], y[NMAX], z[NMAX];

int main()
{
    int n;
    fin >> n;

    for(int i = 1; i <= n; ++i){
        fin >> x[i] >> y[i] >> z[i];

        x[i] -= i;
        y[i] -= i;
        z[i] -= i;
    }

    long long rez = 0;
    for(int i = 1; i <= n; ++i)
        rez += abs(x[i] - x[n / 2 + 1]) + abs(y[i] - y[n / 2 + 1]) + abs(z[i] - z[n / 2 + 1]);
    fout << rez << '\n';
    return 0;
}