#include <stdio.h>
#define pi 3.1415
int main(){
double r,l;
l = 2.*pi*r;
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CiNkZWZpbmUgcGkgMy4xNDE1CmludCBtYWluKCl7CiAgICBkb3VibGUgcixsOwogICAgc2NhbmYoIiVmIiwmcik7CiAgICBsID0gMi4qcGkqcjsKICAgIHByaW50ZigiJS4zbGYiLGwpOwogICAgcmV0dXJuIDA7Cn0=