#include<stdio.h>#include<string.h>#include<math.h>#include<iostream>#include<algorithm>#include<map>#include<set>#include<bitset>#include<vector>#include<cmath>using namespace std;typedef long long int LL;#define double long double#define MAX(a,b) ((a)>(b)?(a):(b))#define MIN(a,b) ((a)<(b)?(a):(b))double p[3][3];double dis(double a[],double b[]){return sqrt((a[0]-b[0])*(a[0]-b[0])+(a[1]-b[1])*(a[1]-b[1])+(a[2]-b[2])*(a[2]-b[2]));}double area(double a,double b,double c){if(a*a>b*b+c*c)return b;double p=(double)(a+b+c)/2.0;return 2*sqrt(p*(p-a)*(p-b)*(p-c))/c;}int main(){int n,i,j;double ans;while(scanf("%d",&n)!=EOF){ans=0;for(i=0;i<2;i++)for(j=0;j<3;j++)scanf("%Lf",&p[i][j]);for(i=0;i<n;i++){for(j=0;j<3;j++)scanf("%Lf",&p[2][j]);ans=MAX(ans,area(dis(p[1],p[2]),dis(p[0],p[2]),dis(p[0],p[1])));}printf("%.2Lfn",ans);}}
