#include<fstream.h>
fstream f("elevi.in",ios::in);
struct elev{char nume[20];
	    char prenume[20];
	    float note[3];
	    float media;
	   };
struct nod{elev e;
           nod *leg;
          };
nod *prim;

void adaugf(nod *&prim,elev x)
{nod *nou=new nod;
 nou->e=x;
 nou->leg=prim;
 prim=nou;
}

void citire()
{int n;elev x;
 f>>n;
 for(int i=1;i<=n;i++)
  {f>>x.nume>>x.prenume>>x.note[0]>>x.note[1]>>x.note[2];
   x.media=(x.note[0]+x.note[1]+x.note[2])/3;
   adaugf(prim,x);
  }
}

void afis(nod *prim)
{nod *p=prim;
 while(p){cout<<p->e.nume<<" "<<p->e.prenume<<" "<<p->e.media<<endl;
 p=p->leg;}
}

float mediagen(nod *prim)
{float s=0;
 int n=0;
 nod *p=prim;
 while(p){s+=p->e.media;n++;p=p->leg;}
 return s/n;
}

void main()
{citire();
 afis(prim);
 cout<<mediagen(prim);
}