#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;

A s[3][32],t[3][32];
int sn[3],tn[3];

int main(){
	sn[0]=sn[1]=1;
	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);
}