#include <fstream>
#include <algorithm>
using namespace std;

ifstream cin("inundatii.in");
ofstream cout("inundatii.out");

const int MAXN = 50000;

int x[1 + MAXN], y[1 + MAXN], z[1 + MAXN];

int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> x[i] >> y[i] >> z[i];
    long long answer = 0;
    for (int i = 1; i <= n; i++) {
        answer += abs(x[n / 2 + 1] - n / 2 - 1 + i - x[i]);
        answer += abs(y[n / 2 + 1] - n / 2 - 1 + i - y[i]);
        answer += abs(z[n / 2 + 1] - n / 2 - 1 + i - z[i]);
    }
    cout << answer << "\n";
    return 0;
}