知识点：运算 

#include <iostream>
#include <cmath>
#include <iomanip>
#define PI 3.14
using namespace std;


int main() {
    int r = 0;
    float volume = 0.0;

    cin >> r;

    volume = 4.0 / 3.0 * PI * pow(r, 3);

    cout << fixed << setprecision(2);
    cout << volume << endl;

    return 0;
}