Untitled

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <iomanip>
using namespace std;
float func(float a,float b,float c) {
	return (float(1.0 / 3.0)) * a * b * c;
}
int main(){
	ifstream in("input.txt");
	ofstream out("result.txt");
	out << setprecision(2);
	float a, b, c;
	in >> a >> b >> c;
	out << (func(a, b, c));
}