#include <cstdio>

#define file_in "inundatii.in"
#define file_out "inundatii.out"

#define Nmax 50010

int n,i,z,x,y,y1,x1,z1,y2,suma=0;

inline int abs(int a) { return a>=0?a:-a; }

int main()
{
	freopen(file_in,"r",stdin);
	freopen(file_out,"w",stdout);
	
	scanf("%d", &n);
	for (i=1;i<=n;++i)
	{
		scanf("%d %d %d", &x,&y,&z);
		x-=1;
	    y-=2;
		z-=3;
		x1=y+1;
		y1=y+2;
		z1=y+3;
		suma+=abs(x-x1)+abs(y-y1)+abs(z-z1);
	}
	
    printf("%d", suma);

	fclose(stdin);
	fclose(stdout);
	
	return 0;
}