#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) ({ulong _z=v;do*--wp=_z%10+48;while(_z/=10);})
#define wt1(v) ({char wbuf[64],*wp=wbuf+sizeof wbuf;wt(v);write(1,wp,wbuf+sizeof wbuf-wp);})
#define rep(v,e) for(typeof(e)v=0;v<e;++v)
#define repeat(e) for(typeof(e)_=e;_--;)
#define chmax(v,a) (v=v>=a?v:a)

typedef unsigned long ulong;
typedef struct{long d,x;}A;

int main(){
	A s[3][32],t[3][32];
	int sn[3],tn[3];
	sn[0]=1;
	s[0][0].d=0;
	s[0][0].x=0;
	sn[1]=1;
	s[1][0].d=0;
	s[1][0].x=0;
	sn[2]=0;
	{
		rd_init();
		long n=rd();
		repeat(n){
			rep(i,3){
				long a=rd();
				tn[i]=0;
				rep(j,3){
					if(i!=j){
						rep(k,sn[j]){
							long x=s[j][k].x+a;
							long d=s[j][k].d+x;
							x=x?x-1:0;
							rep(tr,tn[i]){
								if(t[i][tr].d>=d&&t[i][tr].x>=x){
									goto hoge;
								}
							}
							int tw=0;
							rep(tr,tn[i]){
								if(!(t[i][tr].d<=d&&t[i][tr].x<=x)){
									t[i][tw++]=t[i][tr];
								}
							}
							t[i][tw].x=x;
							t[i][tw].d=d;
							tn[i]=tw+1;
							hoge:;
						}
					}
				}
			}
			rep(i,3){
				sn[i]=tn[i];
				rep(k,tn[i]){
					s[i][k]=t[i][k];
				}
			}
		}
	}
	{
		long z=0;
		rep(i,3){
			rep(k,sn[i]){
				chmax(z,s[i][k].d);
			}
		}
		wt1(z);
	}
	_exit(0);
}