#include <fstream>
#include<stdlib.h>
using namespace std;
ifstream f("inundatii.in");
ofstream g("inundatii.out");
int a[50001],b[50001],c[50001],n,i;
long long s,m1,m2,m3;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>a[i]>>b[i]>>c[i];
    m1=a[(n+1)/2]-(n+1)/2;
    m2=b[(n+1)/2]-(n+1)/2;
    m3=c[(n+1)/2]-(n+1)/2;
    for(i=1;i<=n;i++)
        s+=abs(a[i]-(m1+i))+abs(b[i]-(m2+i))+abs(c[i]-(m3+i));
    g<<s;
}