#include <bits/stdc++.h>
#define PI 3.1415926535


using namespace std;

int main()
{
    double r;

    cin >> r;

    cout << fixed << setprecision(2) << PI * r * r << endl;
    cout << fixed << setprecision(2) << PI * 2 * r << endl;

    return 0;
}

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <string>
#include <iomanip>
#include <cmath>
#include <queue>
#include <map>
#include <stack>
#include <vector>
using namespace std;
#define long long LL
const int N = 1e6+5;
const double pi = 3.1415926535;
double r;
int main(){
    cin>>r;
    double ans = r * r * pi;
    printf("%.2lf",ans);
    cout << endl; 
    ans = r * 2 * pi;
    printf("%.2lf",ans);
    return 0;
}

#include<stdio.h>
using namespace std;
int main()
{
	double x,pi=3.1415926535;
	scanf("%lf",&x);
	printf("%.2lf\n",1.0*pi*x*x);
	printf("%.2lf",1.0*2*pi*x);
	return 0;
} 

#include <iostream>
#include <iomanip>
using namespace std;
int main(){
    double n,pi=3.1415926535;
    cin>>n;
    cout<<fixed<<setprecision(2)<<pi*n*n<<endl;
    cout<<pi*2*n<<endl;
    return 0;
}

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