#include<bits/stdc++.h>
using namespace std;
const double pi=acos(-1);
int main(){
	double r;
	cin>>r;
	printf("%.2lf\n%.2lf",r*r*pi,r*2*pi);
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main(){
    double b,s,c,pi;
    pi=3.1415926;
    cin>>b;
    s=pi*b*b;
    c=pi*2*b;
    cout<<fixed<<setprecision(2)<<s<<endl<<c;
    return 0;
}