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#include <bits/stdc++.h>
using namespace std;
ifstream fin("inundatii.in");
ofstream fout("inundatii.out");
int n , x , y , z , lx , ly , lz , ans;
int main()
{
fin >> n >> lx >> ly >> lz;
for(int i = 2 ; i <= n ; ++ i){
fin >> x >> y >> z;
--x , --y , --z;
ans += abs(x - lx) + abs(y - ly) + abs(z - lz);
++lx , ++ly , ++lz;
}
fout << ans << '\n';
return 0;
}