#include<bits/stdc++.h> using namespace std; int main(){ double r,d,c,s; cin>>r; d=r*2; c=r*2*3.14; s=r*r*3.14; printf("%.4lf",d); cout<<" "; printf("%.4lf",c); cout<<" "; printf("%.4lf",s); return 0; }