import java.util.Scanner;
class Jisuan{
double a,sum;
double s(double a){
double p = 3.141592653;//在类中对于常量赋值只能在方法中，类体中只包含变量声明和方法定义
sum = aap;
return sum;
}
}
public class Main{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
int n,i;
double a;
n = in.nextInt();
double b[] = new double[n+5];
Jisuan jisuan = new Jisuan();
for(i = 1;i<= n;i++) {
b[i] = in.nextDouble();
}
for(i = 1; i<= n;i++) {
a = b[i];
System.out.printf(“Case %d: %.2f\n”,i,jisuan.s(a));
}
}
}