# include <cstdio>
# include <algorithm>

typedef long long ll;
const char FIN[] = "inundatii.in", FOU[] = "inundatii.out";
const int MAX_N = 50005;

int N;
int X[MAX_N], Y[MAX_N], Z[MAX_N];

ll solve ( int XYZ[] )
{
    ll sol = 0;

    for (int i = 0, aux = N >> 1 ; i < N; ++i)
        sol += (ll) abs ( XYZ[i] - XYZ[aux] + aux - i ) ;

    return sol;
}

int main()
{
    freopen ( FIN, "r", stdin ) ;
    freopen ( FOU, "w", stdout ) ;

    scanf("%d", &N);

    for (int i = 0; i < N; ++i)
        scanf("%d %d %d", &X[i], &Y[i], &Z[i]);

    printf("%lld\n", ( ll ) solve ( X ) + solve ( Y ) + solve ( Z ) );
    return 0;
}