tuhu

#include<bits/stdc++.h>
using namespace std;
int main()
{
double r,pi=3.14159,zj,zc,mj;
cin>>r;
zj=r2;
zc=r2pi;
mj=rr*pi;
printf("%.4f",zj);
cout<<" ";
printf("%.4f",zc);
cout<<" ";
printf("%.4f",mj);
cout<<" ";
}