函数运用 + 输入输出

#include<iostream>
#include<cmath>

using namespace std;

double s,t1,t2;
const double pi=3.14;

double size(double r){
	return r*3/4/pi;
}

double r(double s){
	return pow(s,1.0/3);
}

int main(){
	cin>>s>>t1>>t2;
	
	double q=s/t1*t2;
	
	printf("%.2lf",r(size(q)));
	return 0;
}