#include <iostream>
#include <cmath>
using namespace std;

struct point
{ float x,y,z;
};
double dlina (point a)
{ return sqrt(a.x*a.x+a.y*a.y+a.z*a.z);}
int main()
{ point a[100];
int n;
cout<<"Vvedite n";
cin>>n;
for (int i=0; i<n; i++)
{cout<<"Vvedite koordinatu"<<i<<"ot tochki";
cin>>a[i].x>>a[i].y>>a[i].z;}
double max=0; int k=0;
for (int i=0; i<n; i++)
if (dlina (a[i])>max)
{max=dlina(a[i]);
k=i;}
cout<<"k="<<k;
system("PAUSE");
return 0; }