#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; 
}