include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    double a=3.1415926*n*n*1.00;
    double b=3.1415926*2*n*1.00;
    printf("%.2f\n",a);
    printf("%.2f",b);
     
    return 0;
} 
/**************************************************************
	Problem: 1005
	User: suzihang
	Language: C++
	Result: Compile Error
****************************************************************/