#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
    float s,m;
    scanf("%d",r);
    s=r*r*3.1415926;
    m=2*3.1415926*r;
    printf("%.2f",s);
    printf("%.2f",m);
}

/**************************************************************
	Problem: 1005
	User: huanglingkai
	Language: C++
	Result: Runtime Error
****************************************************************/