#include <stdio.h>
int main ()
{
    int a  ;
    while(    scanf("%d",&a)!=EOF)
    {
              if(a == 0)
      {
          printf("0.5\n");
      }
      else if (a < 0)
      {
          printf("0\n");
      }
      else
          printf("1\n");
    }

    return 0;
}