#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    printf("%.2f",3.1415926*n*n);
    cout<<endl;
    printf("%.2f",3.1415926*n*2.0);
    return 0;
}
/**************************************************************
	Problem: 1005
	User: liyunshuo
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/