#include<stdio.h>
#include<stdlib.h>
#define Pi 3.14
double area(int r)
{return Pi*r*r;
}
double perimeter(int r)
{
return 2*Pi*r;
}
void main()
{
?int r;
?double area(int r);
?double perimeter(int r);
?scanf("%f",r);
?printf("%f\n",area(r));
?printf("%f\n",perimeter(r));
?system("pause");
}