#include<bits/stdc++.h>
using namespace std;
int main(){
	int i;
	printf("%.2f\n",3.1415926*i*i);
	printf("%.2f",3.1415926*2*i);
}
/**************************************************************
	Problem: 1005
	User: baizhoudeyueguang
	Language: C++
	Result: Wrong Answer
****************************************************************/