#include<fstream>

using namespace std;

long long v[50005][3];
int myabs(int b)
{
    if(b<0)
       b=-b;
    return b;
}
int main()
{
    ifstream cin("inundatii.in");
    ofstream cout("inundatii.out");
    long long n;
    cin>>n;
    for(long long i=1;i<=n;++i)
    {
         cin>>v[i][0]>>v[i][1]>>v[i][2];
    }
    long long sum=0;
    for(long long j=0;j<3;j++)
    {
    for(long long i=1;i<=n;++i)
        v[i][j]-=i;
    for(long long i=1;i<=n;++i)
        sum+=myabs(v[i][j]-v[(n+1)/2][j]);
    }
    cout<<sum;
    return 0;
}