#include<fstream.h>
#include<math.h>
long long n,x[50000],y[50000],z[50000],i,j,a,b,c,s;
int main()
{
  ifstream f("inundatii.in");
  ofstream g("inundatii.out");
   f>>n;
    for(i=1;i<=n;i++)
     f>>x[i]>>y[i]>>z[i];
   a=x[n];b=y[n];c=z[n];
    for(i=1;i<=n-1;i++)
    {
     a=a-(n-i);b=b-(n-i);c=c-(n-i);
      s=s+abs(a-x[i])+abs(b-y[i])+abs(c-z[i]);
    }
   g<<s;
  return 0;
}