#include<cstdio>
using namespace std;
int n;
struct ff
{
	int x,y,z;
}f[111111]={};
int a=1234567890,b=1234567890,c=1234567890;
int main()
{
	freopen("playwithboss.in","r",stdin);
	freopen("playwithboss.out","w",stdout);
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
		scanf("%d%d%d",&f[i].x,&f[i].y,&f[i].z),f[i].x++,f[i].y++,f[i].z++;
	for(int i=1;i<=n;i++)
	{
		int weizhi=0;
		int ggg=0;
		if(a-f[i].x>ggg)
			ggg=a-f[i].x,weizhi=1;
		if(b-f[i].y>ggg)
			ggg=a-f[i].y,weizhi=2;
		if(c-f[i].z>ggg)
			ggg=a-f[i].z,weizhi=3;
		if(weizhi==1)
			a=f[i].x;
		if(weizhi==2)
			b=f[i].y;
		if(weizhi==3)
			c=f[i].z;
	}
	printf("%d\n",a+b+c-7);
	return 0;
}