#include
#include
#include
using namespace std;
int main()
{
const double pi=acos(-1);
double r, h, s;
scanf("%1f%1f",&r,&h);
s=2.0*pi*r*r+2.0*pi*r*h;
printf("%.3f",s);
return 0;
}
#include
#include
#include
using namespace std;
int main()
{
const double pi=acos(-1);
double r, h, s;
scanf("%1f%1f",&r,&h);
s=2.0*pi*r*r+2.0*pi*r*h;
printf("%.3f",s);
return 0;
}
scanf("%1f%1f",&r,&h);
->
scanf("%lf%lf",&r,&h);