#include<cstdio>
int main() {
    int r;
	double PI=3.1415926;
    scanf("%d",&r);
	double area = PI * r * r; 
    double perimeter = 2 * PI * r; 
    printf("%.2lf\n%.2lf\n", area, perimeter);
    return 0;
}
/**************************************************************
	Problem: 1005
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/