#include"bits/stdc++.h"
using namespace std;
typedef long long ll;
template<class T1,class T2> bool cmin(T1 &x,const T2 &y) { if (y<x) { x=y; return 1; }return 0; }
template<class T1,class T2> bool cmax(T1 &x,const T2 &y) { if (x<y) { x=y; return 1; }return 0; }
#define all(x) (x).begin(),(x).end()
struct Vector
{
	ll x,y,z;
	Vector operator-(const Vector b)const
	{
		return {x-b.x,y-b.y,z-b.z};
	}
};
long double vol(Vector o,Vector a,Vector b,Vector c)
{
	Vector p=b-a,q=c-a;
	ll A=p.y*q.z-p.z*q.y,B=p.z*q.x-p.x*q.z,C=p.x*q.y-p.y*q.x;
	ll D=A*a.x+B*a.y+C*a.z;
	// cerr<<A<<' '<<B<<' '<<C<<' '<<D<<'\n';
	long double X=(D-B*o.y-C*o.z)/(long double)A-o.x,Y=(D-A*o.x-C*o.z)/(long double)B-o.y,Z=(D-B*o.y-A*o.x)/(long double)C-o.z;
	if (X<0||Y<0||Z<0)
		return 0;
	else
		return X*Y*Z/6;
}
int main()
{
	ios::sync_with_stdio(0); cin.tie(0);
	cout<<fixed<<setprecision(9);
	Vector d;
	while (cin>>d.x>>d.y>>d.z)
	{
		Vector a,b,c,e;
		cin>>e.x>>e.y>>e.z;
		// cin>>a.x>>a.y>>a.z;
		// cin>>b.x>>b.y>>b.z;
		// cin>>c.x>>c.y>>c.z;
		int fx=0,fy=0,fz=0;
		fx=e.x<d.x,fy=e.y<d.y,fz=e.z<d.z;
		Vector p,q;
		cin>>p.x>>p.y>>p.z;
		cin>>q.x>>q.y>>q.z;
		if (fx)
		{
			p.x=2*d.x-p.x;
			q.x=2*d.x-q.x;
			e.x=2*d.x-e.x;
		}
		if (fy)
		{
			p.y=2*d.y-p.y;
			q.y=2*d.y-q.y;
			e.y=2*d.y-e.y;
		}
		if (fz)
		{
			p.z=2*d.z-p.z;
			q.z=2*d.z-q.z;
			e.z=2*d.z-e.z;
		}
		a=d,b=d,c=d;
		a.x=e.x,b.y=e.y,c.z=e.z;
		if (p.x>q.x)
			swap(p.x,q.x);
		if (p.y>q.y)
			swap(p.y,q.y);
		if (p.z>q.z)
			swap(p.z,q.z);
		p.x=max(p.x,d.x);
		p.y=max(p.y,d.y);
		p.z=max(p.z,d.z);
		q.x=min(q.x,e.x);
		q.y=min(q.y,e.y);
		q.z=min(q.z,e.z);
		int flag=0;
		if (p.x>q.x)
			flag=1;
		if (p.y>q.y)
			flag=1;
		if (p.z>q.z)
			flag=1;
		if (flag)
		{
			cout<<"0\n";
			continue;
		}
		double ans=0;
		for (int i=0; i<2; i++)
			for (int j=0; j<2; j++)
				for (int k=0; k<2; k++)
				{
					// cerr<<"GG\n";
					ans+=(((i^j^k)&1)?(-1):(1))*vol({i?q.x:p.x,j?q.y:p.y,k?q.z:p.z},a,b,c);
				}
		cout<<max<long double>(0.0,ans)<<'\n';
	}
}