#include<stdio.h>#include<string.h>#include<iostream>#include<algorithm>using namespace std;struct data{ int x1,y1,z1; int x2,y2,z2; data(){} data(int _x,int _y,int _z,int _d) { x1=_x;y1=_y;z1=_z; x2=_x+_d;y2=_y+_d;z2=_z+_d; } data(int _x1,int _y1,int _z1,int _x2,int _y2,int _z2) { x1=_x1;y1=_y1;z1=_z1; x2=_x2;y2=_y2;z2=_z2; } bool ok() { return x1<x2&&y1<y2&&z1<z2; } int volume() { if(ok()) return (x2-x1)*(y2-y1)*(z2-z1); else return 0; }};data inter(data a,data b){ if(a.ok()) return data(max(a.x1,b.x1),max(a.y1,b.y1),max(a.z1,b.z1),min(a.x2,b.x2),min(a.y2,b.y2),min(a.z2,b.z2)); else return data(0,0,0,-1);}int main(){ int n,x,y,z,d; while(scanf("%d",&n),n) { scanf("%d%d%d%d",&x,&y,&z,&d); data ans(x,y,z,d); for(int i=1;i<n;i++) { scanf("%d%d%d%d",&x,&y,&z,&d); ans=inter(ans,data(x,y,z,d)); } printf("%dn",ans.volume()); } return 0;}
