#include <iostream>
using namespace std;

int main(){
    float A, r, phi;
    phi = 22/7;
    cin >> r;
    if ( r < 0 ) return 0;
    else {
             A = 4/3 * phi * r * r * r;
             cout << A << endl;
             if ( A < 100 ) cout << "kecil";
             else if ( A >= 100 && A <= 500 ) cout << "sedang";
             else cout << "besar";
    }
}