#include <iostream>
using namespace std;

int main() {
    const double pi = 3.141593;
    int r = 5;
    
    // 计算圆的周长
    double circumference = 2 * pi * r;
    // 计算圆的面积
    double area = pi * r * r;
    // 计算球的体积
    double volume = (4.0 / 3.0) * pi * r * r * r;
    
    // 输出结果，每行一个
    cout << circumference << endl;
    cout << area << endl;
    cout << volume << endl;
    
    return 0;
}