#include<bits/stdc++.h> using namespace std; int main(){ double s,t1,t2,s1,pi=3.14; cin>>s>>t1>>t2; s1=s/t1t2; printf("%.2f",cbrt(s1/(4/3.0pi))); return 0; }

#include<bits/stdc++.h> using namespace std; double v,m,n; double sum=0,cnt=0; void add(); int main(){ cin>>v>>m>>n; add(); return 0; } void add(){ sum+=v/mn; cnt=sum/43/3.14; printf("%.2f",pow(cnt,1.0/3)); }

#include <bits/stdc++.h> using namespace std; double s,t1,t2; int main() { cin>>s>>t1>>t2; double V_ball=s/t1t23/4/3.14; double r=pow(V_ball,1.0/3); cout<<fixed<<setprecision(2)<<r; return 0; }