#include<iostream> #include<cstdio> #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ double pi=3.1415926,vq,r; cin>>r; vq=4.0/3*pi*r*r*r; printf("%.4lf",vq); return 0; }