#include<bits/stdc++.h>
using namespace std;
int main(){
/* float a,b;
double c;
cin>>a>>b;
c=(double)a/b;
cout<<fixed<<setprecision(9)<<c<<endl;*/
float r;
double a,b,c;
scanf("%f",&r);
a=2*r;
b=a*3.1415926;
c=r*r*3.1415926;
printf("%0.4f %0.4f %0.4f",a,b,c);
}
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