#include<stdio.h>
int main()
{
    int a,k;
    scanf("%d %d",&a,&k);
    double ip,l;
    ip=3.1415926;
        if(k==1)
            printf("%.2f\n",ip*a*a);
        else if(k==2)
            printf("%.2f\n",ip*2*a);
        else if(k==3)
            printf("%.2f %.2f\n",ip*a*a,ip*2*a);   
        return 0;
}