#include<iostream>
#include<cstdio>
int r;
int main() {
    double PI=3.1415926;
    scanf("%d",&r);
	double c = 2 * PI * r; 
    double s = PI * r * r; 

    printf("圆的半径为%.2lf, 周长为%.2lf, 面积为%.2lf\n", r, c, s);

    return 0;
}
/**************************************************************
	Problem: 1005
	User: fuhoubin
	Language: C++
	Result: Wrong Answer
****************************************************************/