#include<bits/stdc++.h> using namespace std; const double pi=acos(-1); double v(double r){return 4*pi*r*r*r/3;} int main() { double x1,y1,z1,r1,x2,y2,z2,r2,x,m,n,ans; cin>>x1>>y1>>z1>>r1>>x2>>y2>>z2>>r2; x=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)+...