include<stdio.h>
int main(){
double a;
double pi = 3.14159;
scanf("%lf",&a);
printf("%.6lf\n",2pia);
printf("%.6lf",piaa);
return 0;
}
int main(){
double a;
double pi = 3.14159;
scanf("%lf",&a);
printf("%.6lf\n",2pia);
printf("%.6lf",piaa);
return 0;
}