zoj 3550 Big Keng

#include<cstdio>#include<cstring>#include<cstdlib>#include<ctime>#include<algorithm>#include<iostream>#include<string>#include<cmath>#include<queue>#include<vector>#include<map>using namespace std;int main(){ double V; while (~scanf("%lf",&V)) printf("%.6lfn",pow(V,2.0/3.0)*3.9397731079);}