#include<bits/stdc++>
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\n",c);
    return 0;
}
/**************************************************************
	Problem: 1005
	User: linyuhang
	Language: C++
	Result: Compile Error
****************************************************************/