#include <stdio.h>

#define MAX_N 50005
#define FIN "inundatii.in"
#define FOUT "inundatii.out"
#define ll long long
#define abs(x) ((x) < 0 ? -(x) : (x))

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

ll solve(int A[]) 
{
    int i, med = A[N/2]-N/2;
    ll ret = 0;

    for (i = 0; i < N; ++i)
        ret += abs(A[i]-(med+i));
    return ret;
}

int main(void)
{
    int i;

    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);

    scanf("%d", &N);
    for (i = 0; i < N; ++i)
        scanf("%d %d %d", X+i, Y+i, Z+i);
    printf("%lld\n", solve(X)+solve(Y)+solve(Z));

    return 0;
}