#include<bits/stdc++.h>
using namespace std;
int main(){
    int r;
    float s,c;
    cin>>r;
    s=3.1415926*r*r;
    c=3.1415926*r*2;
    printf("%.2f\n",s);
    printf("%.2f",c);
      
     
} 
/**************************************************************
	Problem: 1005
	User: huanglingkai
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/