#include<algorithm>
#include<iostream>
#include<vector>
#include<cmath>
using namespace std;
typedef long long lint;
typedef vector<int>vi;
typedef pair<int,int>pii;
#define rep(i,n)for(int i=0;i<(int)(n);++i)

double q[4][4][4];

const int R=100;

double calc(int low,int high,double decfac,bool trunc){
  double volt=0.0;
  for(int i=low;i<=high;++i){
    for(int j=low;j<=high;++j){
      for(int k=low;k<=high;++k){
	rep(l,4){
	  double x=4*i+l;
	  if(trunc&&x>4*R)continue;
	  rep(m,4){
	    double y=4*j+m;
	    if(trunc&&y>4*R)continue;
	    rep(nn,2){
	      int n=2*nn+((l+m)%2);
	      double z=4*k+n;
	      if(trunc&&z>4*R)continue;
	      double fac=1;
#define dec(x) if(x==4*low||x==4*high)fac*=decfac;
	      dec(x);
	      dec(y);
	      dec(z);
	      double sq=sqrt(x*x+y*y+z*z)/4;
	      if(sq==0)continue;
	      volt+=q[l][m][n]/sq*fac;
	    }
	  }
	}
      }
    }
  }
  return volt;
}

int main(){
  rep(i, 8) {
    int u = 2 * (i / 4);
    int v = 2 * (i / 2 % 2);
    int w = 2 * (i % 2);
    cin>>q[u][v][w];
  }
  rep(i, 8) {
    int u = 2 * (i / 4) + 1;
    int v = 2 * (i / 2 % 2) + 1;
    int w = 2 * (i % 2) + 1;
    cin>>q[u][v][w];
  }
  double volt=calc(-R,R,0.5,true);
  double volt_notrunc=calc(-R,R,1,false);
  printf("%.15f\n",(volt+volt_notrunc)/2);
}