#include <fstream.h>
unsigned long n,dist;

int main()
{unsigned long i,x,y,z;
ifstream f("inundatii.in");
f>>n;
f>>x>>y>>z;
dist+=x+y+z;
for(i=1;i<n;i++)
 f>>x>>y>>z;
dist-=x+y+z;
dist+=3*(n-1);
f.close();
ofstream g("inundatii.out");
g<<dist<<'\n';
g.close();
return 0;
}