#include<bits/stdc++.h>

using namespace std;

int main()

{

double a,b,c,d,s=3.14159;

cin>>a;

b=1.0*a*2;

c=1.0*b*s;

d=1.0*s*a*a;

printf("%.4lf ",b);

printf("%.4lf ",c);

printf("%.4lf ",d);

return 0;

}

#include<bits/stdc++.h> using namespace std; int main(){ double r,d,c,s,pi=3.14159; cin>> r; d=r2; c=dpi; s=pirr; printf("%.4lf",d); cout<<" "; printf("%.4lf",c); cout<<" "; printf("%.4lf",s); return 0; }